remove singleton usage of i18n (#14422)

closes https://github.com/twentyhq/core-team-issues/issues/1480

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-emails/src/components/BaseEmail.tsx

@@ -1,42 +1,11 @@
-import { i18n, type Messages } from '@lingui/core';
 import { I18nProvider } from '@lingui/react';
 import { Container, Html } from '@react-email/components';
 
 import { BaseHead } from 'src/components/BaseHead';
 import { Footer } from 'src/components/Footer';
 import { Logo } from 'src/components/Logo';
-import { type APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
-import { messages as afMessages } from '../locales/generated/af-ZA';
-import { messages as arMessages } from '../locales/generated/ar-SA';
-import { messages as caMessages } from '../locales/generated/ca-ES';
-import { messages as csMessages } from '../locales/generated/cs-CZ';
-import { messages as daMessages } from '../locales/generated/da-DK';
-import { messages as deMessages } from '../locales/generated/de-DE';
-import { messages as elMessages } from '../locales/generated/el-GR';
-import { messages as enMessages } from '../locales/generated/en';
-import { messages as esMessages } from '../locales/generated/es-ES';
-import { messages as fiMessages } from '../locales/generated/fi-FI';
-import { messages as frMessages } from '../locales/generated/fr-FR';
-import { messages as heMessages } from '../locales/generated/he-IL';
-import { messages as huMessages } from '../locales/generated/hu-HU';
-import { messages as itMessages } from '../locales/generated/it-IT';
-import { messages as jaMessages } from '../locales/generated/ja-JP';
-import { messages as koMessages } from '../locales/generated/ko-KR';
-import { messages as nlMessages } from '../locales/generated/nl-NL';
-import { messages as noMessages } from '../locales/generated/no-NO';
-import { messages as plMessages } from '../locales/generated/pl-PL';
-import { messages as pseudoEnMessages } from '../locales/generated/pseudo-en';
-import { messages as ptBRMessages } from '../locales/generated/pt-BR';
-import { messages as ptPTMessages } from '../locales/generated/pt-PT';
-import { messages as roMessages } from '../locales/generated/ro-RO';
-import { messages as ruMessages } from '../locales/generated/ru-RU';
-import { messages as srMessages } from '../locales/generated/sr-Cyrl';
-import { messages as svMessages } from '../locales/generated/sv-SE';
-import { messages as trMessages } from '../locales/generated/tr-TR';
-import { messages as ukMessages } from '../locales/generated/uk-UA';
-import { messages as viMessages } from '../locales/generated/vi-VN';
-import { messages as zhHansMessages } from '../locales/generated/zh-CN';
-import { messages as zhHantMessages } from '../locales/generated/zh-TW';
+import { createI18nInstance } from 'src/utils/i18n.utils';
+import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type BaseEmailProps = {
   children: JSX.Element | JSX.Element[] | string;
@@ -44,59 +13,17 @@ type BaseEmailProps = {
   locale: keyof typeof APP_LOCALES;
 };
 
-const messages: Record<keyof typeof APP_LOCALES, Messages> = {
-  en: enMessages,
-  'pseudo-en': pseudoEnMessages,
-  'af-ZA': afMessages,
-  'ar-SA': arMessages,
-  'ca-ES': caMessages,
-  'cs-CZ': csMessages,
-  'da-DK': daMessages,
-  'de-DE': deMessages,
-  'el-GR': elMessages,
-  'es-ES': esMessages,
-  'fi-FI': fiMessages,
-  'fr-FR': frMessages,
-  'he-IL': heMessages,
-  'hu-HU': huMessages,
-  'it-IT': itMessages,
-  'ja-JP': jaMessages,
-  'ko-KR': koMessages,
-  'nl-NL': nlMessages,
-  'no-NO': noMessages,
-  'pl-PL': plMessages,
-  'pt-BR': ptBRMessages,
-  'pt-PT': ptPTMessages,
-  'ro-RO': roMessages,
-  'ru-RU': ruMessages,
-  'sr-Cyrl': srMessages,
-  'sv-SE': svMessages,
-  'tr-TR': trMessages,
-  'uk-UA': ukMessages,
-  'vi-VN': viMessages,
-  'zh-CN': zhHansMessages,
-  'zh-TW': zhHantMessages,
-};
-
-(Object.entries(messages) as [keyof typeof APP_LOCALES, any][]).forEach(
-  ([locale, message]) => {
-    i18n.load(locale, message);
-  },
-);
-
-i18n.activate(SOURCE_LOCALE);
-
 export const BaseEmail = ({ children, width, locale }: BaseEmailProps) => {
-  i18n.activate(locale);
+  const i18nInstance = createI18nInstance(locale);
 
   return (
-    <I18nProvider i18n={i18n}>
+    <I18nProvider i18n={i18nInstance}>
       <Html lang={locale}>
         <BaseHead />
         <Container width={width || 290}>
           <Logo />
           {children}
-          <Footer />
+          <Footer i18n={i18nInstance} />
         </Container>
       </Html>
     </I18nProvider>

packages/twenty-emails/src/components/Footer.tsx

@@ -1,4 +1,4 @@
-import { i18n } from '@lingui/core';
+import { type I18n } from '@lingui/core';
 import { Column, Container, Row } from '@react-email/components';
 import { Link } from 'src/components/Link';
 import { ShadowText } from 'src/components/ShadowText';
@@ -7,7 +7,11 @@ const footerContainerStyle = {
   marginTop: '12px',
 };
 
-export const Footer = () => {
+type FooterProps = {
+  i18n: I18n;
+};
+
+export const Footer = ({ i18n }: FooterProps) => {
   return (
     <Container style={footerContainerStyle}>
       <Row>

packages/twenty-emails/src/components/WhatIsTwenty.tsx

@@ -1,8 +1,12 @@
-import { i18n } from '@lingui/core';
+import { type I18n } from '@lingui/core';
 import { MainText } from 'src/components/MainText';
 import { SubTitle } from 'src/components/SubTitle';
 
-export const WhatIsTwenty = () => {
+type WhatIsTwentyProps = {
+  i18n: I18n;
+};
+
+export const WhatIsTwenty = ({ i18n }: WhatIsTwentyProps) => {
   return (
     <>
       <SubTitle value={i18n._('What is Twenty?')} />

packages/twenty-emails/src/emails/clean-suspended-workspace.email.tsx

@@ -1,9 +1,9 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { CallToAction } from 'src/components/CallToAction';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type CleanSuspendedWorkspaceEmailProps = {
@@ -19,6 +19,8 @@ export const CleanSuspendedWorkspaceEmail = ({
   workspaceDisplayName,
   locale,
 }: CleanSuspendedWorkspaceEmailProps) => {
+  const i18n = createI18nInstance(locale);
+
   return (
     <BaseEmail width={333} locale={locale}>
       <Title value={i18n._('Deleted Workspace')} />
@@ -58,6 +60,6 @@ CleanSuspendedWorkspaceEmail.PreviewProps = {
   userName: 'John Doe',
   workspaceDisplayName: 'My Workspace',
   locale: 'en',
-} as CleanSuspendedWorkspaceEmailProps;
+};
 
 export default CleanSuspendedWorkspaceEmail;

packages/twenty-emails/src/emails/password-reset-link.email.tsx

@@ -1,10 +1,10 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { CallToAction } from 'src/components/CallToAction';
 import { Link } from 'src/components/Link';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type PasswordResetLinkEmailProps = {
@@ -18,6 +18,8 @@ export const PasswordResetLinkEmail = ({
   link,
   locale,
 }: PasswordResetLinkEmailProps) => {
+  const i18n = createI18nInstance(locale);
+
   return (
     <BaseEmail locale={locale}>
       <Title value={i18n._('Reset your password 🗝')} />

packages/twenty-emails/src/emails/password-update-notify.email.tsx

@@ -1,9 +1,9 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { CallToAction } from 'src/components/CallToAction';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type PasswordUpdateNotifyEmailProps = {
@@ -19,6 +19,7 @@ export const PasswordUpdateNotifyEmail = ({
   link,
   locale,
 }: PasswordUpdateNotifyEmailProps) => {
+  const i18n = createI18nInstance(locale);
   const formattedDate = i18n.date(new Date());
 
   return (

packages/twenty-emails/src/emails/send-email-verification-link.email.tsx

@@ -1,9 +1,9 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { CallToAction } from 'src/components/CallToAction';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type SendEmailVerificationLinkEmailProps = {
@@ -15,6 +15,8 @@ export const SendEmailVerificationLinkEmail = ({
   link,
   locale,
 }: SendEmailVerificationLinkEmailProps) => {
+  const i18n = createI18nInstance(locale);
+
   return (
     <BaseEmail width={333} locale={locale}>
       <Title value={i18n._('Confirm your email address')} />

packages/twenty-emails/src/emails/send-invite-link.email.tsx

@@ -1,4 +1,3 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { Img } from '@react-email/components';
 import { emailTheme } from 'src/common-style';
@@ -12,6 +11,7 @@ import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
 import { WhatIsTwenty } from 'src/components/WhatIsTwenty';
 import { capitalize } from 'src/utils/capitalize';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 import { getImageAbsoluteURI } from 'twenty-shared/utils';
 
@@ -34,6 +34,7 @@ export const SendInviteLinkEmail = ({
   serverUrl,
   locale,
 }: SendInviteLinkEmailProps) => {
+  const i18n = createI18nInstance(locale);
   const workspaceLogo = workspace.logo
     ? getImageAbsoluteURI({ imageUrl: workspace.logo, baseUrl: serverUrl })
     : null;
@@ -76,7 +77,7 @@ export const SendInviteLinkEmail = ({
         {workspace.name ? <HighlightedText value={workspace.name} /> : <></>}
         <CallToAction href={link} value={i18n._('Accept invite')} />
       </HighlightedContainer>
-      <WhatIsTwenty />
+      <WhatIsTwenty i18n={i18n} />
     </BaseEmail>
   );
 };

packages/twenty-emails/src/emails/test.email.tsx

@@ -1,6 +1,6 @@
-import { i18n } from '@lingui/core';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type TestEmailProps = {
@@ -10,6 +10,8 @@ type TestEmailProps = {
 // This is a test email which isn't used in production
 // It's useful to do tests and play in a local environment
 export const TestEmail = ({ locale }: TestEmailProps) => {
+  const i18n = createI18nInstance(locale);
+
   return (
     <BaseEmail locale={locale}>
       <Title value={i18n._('Test email')} />
@@ -21,6 +23,6 @@ export const TestEmail = ({ locale }: TestEmailProps) => {
 
 TestEmail.PreviewProps = {
   locale: 'en',
-} as TestEmailProps;
+};
 
 export default TestEmail;

packages/twenty-emails/src/emails/validate-approved-access-domain.email.tsx

@@ -1,4 +1,3 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { Img } from '@react-email/components';
 import { emailTheme } from 'src/common-style';
@@ -11,6 +10,7 @@ import { Link } from 'src/components/Link';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
 import { capitalize } from 'src/utils/capitalize';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 import { getImageAbsoluteURI } from 'twenty-shared/utils';
 import { DEFAULT_WORKSPACE_LOGO } from 'src/constants/DefaultWorkspaceLogo';
@@ -36,6 +36,7 @@ export const SendApprovedAccessDomainValidation = ({
   serverUrl,
   locale,
 }: SendApprovedAccessDomainValidationProps) => {
+  const i18n = createI18nInstance(locale);
   const workspaceLogo = workspace.logo
     ? getImageAbsoluteURI({ imageUrl: workspace.logo, baseUrl: serverUrl })
     : null;
@@ -92,6 +93,6 @@ SendApprovedAccessDomainValidation.PreviewProps = {
   },
   serverUrl: 'https://app.twenty.com',
   locale: 'en',
-} as SendApprovedAccessDomainValidationProps;
+};
 
 export default SendApprovedAccessDomainValidation;

packages/twenty-emails/src/emails/warn-suspended-workspace.email.tsx

@@ -1,9 +1,9 @@
-import { i18n } from '@lingui/core';
 import { Trans } from '@lingui/react';
 import { BaseEmail } from 'src/components/BaseEmail';
 import { CallToAction } from 'src/components/CallToAction';
 import { MainText } from 'src/components/MainText';
 import { Title } from 'src/components/Title';
+import { createI18nInstance } from 'src/utils/i18n.utils';
 import { type APP_LOCALES } from 'twenty-shared/translations';
 
 type WarnSuspendedWorkspaceEmailProps = {
@@ -21,6 +21,7 @@ export const WarnSuspendedWorkspaceEmail = ({
   workspaceDisplayName,
   locale,
 }: WarnSuspendedWorkspaceEmailProps) => {
+  const i18n = createI18nInstance(locale);
   const daysLeft = inactiveDaysBeforeDelete - daysSinceInactive;
   const dayOrDays = daysLeft > 1 ? 'days' : 'day';
   const remainingDays = daysLeft > 0 ? daysLeft : 0;

packages/twenty-emails/src/utils/i18n.utils.ts

@@ -0,0 +1,86 @@
+import { setupI18n, type I18n, type Messages } from '@lingui/core';
+import { type APP_LOCALES } from 'twenty-shared/translations';
+import { isDefined } from 'twenty-shared/utils';
+import { messages as afMessages } from '../locales/generated/af-ZA';
+import { messages as arMessages } from '../locales/generated/ar-SA';
+import { messages as caMessages } from '../locales/generated/ca-ES';
+import { messages as csMessages } from '../locales/generated/cs-CZ';
+import { messages as daMessages } from '../locales/generated/da-DK';
+import { messages as deMessages } from '../locales/generated/de-DE';
+import { messages as elMessages } from '../locales/generated/el-GR';
+import { messages as enMessages } from '../locales/generated/en';
+import { messages as esMessages } from '../locales/generated/es-ES';
+import { messages as fiMessages } from '../locales/generated/fi-FI';
+import { messages as frMessages } from '../locales/generated/fr-FR';
+import { messages as heMessages } from '../locales/generated/he-IL';
+import { messages as huMessages } from '../locales/generated/hu-HU';
+import { messages as itMessages } from '../locales/generated/it-IT';
+import { messages as jaMessages } from '../locales/generated/ja-JP';
+import { messages as koMessages } from '../locales/generated/ko-KR';
+import { messages as nlMessages } from '../locales/generated/nl-NL';
+import { messages as noMessages } from '../locales/generated/no-NO';
+import { messages as plMessages } from '../locales/generated/pl-PL';
+import { messages as pseudoEnMessages } from '../locales/generated/pseudo-en';
+import { messages as ptBRMessages } from '../locales/generated/pt-BR';
+import { messages as ptPTMessages } from '../locales/generated/pt-PT';
+import { messages as roMessages } from '../locales/generated/ro-RO';
+import { messages as ruMessages } from '../locales/generated/ru-RU';
+import { messages as srMessages } from '../locales/generated/sr-Cyrl';
+import { messages as svMessages } from '../locales/generated/sv-SE';
+import { messages as trMessages } from '../locales/generated/tr-TR';
+import { messages as ukMessages } from '../locales/generated/uk-UA';
+import { messages as viMessages } from '../locales/generated/vi-VN';
+import { messages as zhHansMessages } from '../locales/generated/zh-CN';
+import { messages as zhHantMessages } from '../locales/generated/zh-TW';
+
+const messages: Record<keyof typeof APP_LOCALES, Messages> = {
+  en: enMessages,
+  'pseudo-en': pseudoEnMessages,
+  'af-ZA': afMessages,
+  'ar-SA': arMessages,
+  'ca-ES': caMessages,
+  'cs-CZ': csMessages,
+  'da-DK': daMessages,
+  'de-DE': deMessages,
+  'el-GR': elMessages,
+  'es-ES': esMessages,
+  'fi-FI': fiMessages,
+  'fr-FR': frMessages,
+  'he-IL': heMessages,
+  'hu-HU': huMessages,
+  'it-IT': itMessages,
+  'ja-JP': jaMessages,
+  'ko-KR': koMessages,
+  'nl-NL': nlMessages,
+  'no-NO': noMessages,
+  'pl-PL': plMessages,
+  'pt-BR': ptBRMessages,
+  'pt-PT': ptPTMessages,
+  'ro-RO': roMessages,
+  'ru-RU': ruMessages,
+  'sr-Cyrl': srMessages,
+  'sv-SE': svMessages,
+  'tr-TR': trMessages,
+  'uk-UA': ukMessages,
+  'vi-VN': viMessages,
+  'zh-CN': zhHansMessages,
+  'zh-TW': zhHantMessages,
+};
+
+const i18nInstancesMap: Partial<Record<keyof typeof APP_LOCALES, I18n>> = {};
+
+export const createI18nInstance = (locale: keyof typeof APP_LOCALES): I18n => {
+  if (isDefined(i18nInstancesMap[locale])) {
+    return i18nInstancesMap[locale];
+  }
+
+  const i18nInstance = setupI18n();
+  const localeMessages = messages[locale] ?? messages.en;
+
+  i18nInstance.load(locale, localeMessages);
+  i18nInstance.activate(locale);
+
+  i18nInstancesMap[locale] = i18nInstance;
+
+  return i18nInstance;
+};

packages/twenty-server/src/engine/core-modules/approved-access-domain/services/approved-access-domain.spec.ts

@@ -249,6 +249,7 @@ describe('ApprovedAccessDomainService', () => {
       const sender = {
         userEmail: 'sender@example.com',
         name: { firstName: 'John', lastName: 'Doe' },
+        locale: 'en',
       } as WorkspaceMemberWorkspaceEntity;
       const workspace = {
         displayName: 'Test Workspace',

packages/twenty-server/src/engine/core-modules/auth/services/auth.service.spec.ts

@@ -26,6 +26,7 @@ import { GuardRedirectService } from 'src/engine/core-modules/guard-redirect/ser
 import { AuthProviderEnum } from 'src/engine/core-modules/workspace/types/workspace.type';
 import { WorkspaceAgnosticTokenService } from 'src/engine/core-modules/auth/token/services/workspace-agnostic-token.service';
 import { DomainManagerService } from 'src/engine/core-modules/domain-manager/services/domain-manager.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 import { AuthService } from './auth.service';
 
@@ -134,6 +135,14 @@ describe('AuthService', () => {
             findWorkspaceFromWorkspaceIdOrAuthProvider: jest.fn(),
           },
         },
+        {
+          provide: I18nService,
+          useValue: {
+            getI18nInstance: jest.fn().mockReturnValue({
+              _: jest.fn().mockReturnValue('mocked-translation'),
+            }),
+          },
+        },
       ],
     }).compile();
 

packages/twenty-server/src/engine/core-modules/auth/services/auth.service.ts

@@ -3,8 +3,7 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import crypto from 'node:crypto';
 
-import { i18n } from '@lingui/core';
-import { t } from '@lingui/core/macro';
+import { t, msg } from '@lingui/core/macro';
 import { render } from '@react-email/render';
 import { addMilliseconds } from 'date-fns';
 import ms from 'ms';
@@ -54,6 +53,7 @@ import { type WorkspaceSubdomainCustomDomainAndIsCustomDomainEnabledType } from
 import { DomainManagerService } from 'src/engine/core-modules/domain-manager/services/domain-manager.service';
 import { EmailService } from 'src/engine/core-modules/email/email.service';
 import { GuardRedirectService } from 'src/engine/core-modules/guard-redirect/services/guard-redirect.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { UserWorkspaceService } from 'src/engine/core-modules/user-workspace/user-workspace.service';
 import { UserService } from 'src/engine/core-modules/user/services/user.service';
@@ -87,6 +87,7 @@ export class AuthService {
     private readonly emailService: EmailService,
     @InjectRepository(AppToken)
     private readonly appTokenRepository: Repository<AppToken>,
+    private readonly i18nService: I18nService,
   ) {}
 
   private async checkAccessAndUseInvitationOrThrow(
@@ -485,14 +486,16 @@ export class AuthService {
     const html = render(emailTemplate, { pretty: true });
     const text = render(emailTemplate, { plainText: true });
 
-    i18n.activate(firstUserWorkspace.locale);
+    const passwordChangedMsg = msg`Your Password Has Been Successfully Changed`;
+    const i18n = this.i18nService.getI18nInstance(firstUserWorkspace.locale);
+    const subject = i18n._(passwordChangedMsg);
 
     await this.emailService.send({
       from: `${this.twentyConfigService.get(
         'EMAIL_FROM_NAME',
       )} <${this.twentyConfigService.get('EMAIL_FROM_ADDRESS')}>`,
       to: user.email,
-      subject: t`Your Password Has Been Successfully Changed`,
+      subject,
       text,
       html,
     });

packages/twenty-server/src/engine/core-modules/auth/services/reset-password.service.spec.ts

@@ -14,6 +14,7 @@ import { EmailService } from 'src/engine/core-modules/email/email.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { User } from 'src/engine/core-modules/user/user.entity';
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 import { ResetPasswordService } from './reset-password.service';
 
@@ -67,6 +68,14 @@ describe('ResetPasswordService', () => {
             get: jest.fn(),
           },
         },
+        {
+          provide: I18nService,
+          useValue: {
+            getI18nInstance: jest.fn().mockReturnValue({
+              _: jest.fn().mockReturnValue('mocked-translation'),
+            }),
+          },
+        },
       ],
     }).compile();
 

packages/twenty-server/src/engine/core-modules/auth/services/reset-password.service.ts

@@ -3,8 +3,7 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import crypto from 'crypto';
 
-import { i18n } from '@lingui/core';
-import { t } from '@lingui/core/macro';
+import { msg } from '@lingui/core/macro';
 import { render } from '@react-email/render';
 import { addMilliseconds, differenceInMilliseconds } from 'date-fns';
 import ms from 'ms';
@@ -28,6 +27,7 @@ import { type PasswordResetToken } from 'src/engine/core-modules/auth/dto/token.
 import { type ValidatePasswordResetToken } from 'src/engine/core-modules/auth/dto/validate-password-reset-token.entity';
 import { DomainManagerService } from 'src/engine/core-modules/domain-manager/services/domain-manager.service';
 import { EmailService } from 'src/engine/core-modules/email/email.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { User } from 'src/engine/core-modules/user/user.entity';
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
@@ -45,6 +45,7 @@ export class ResetPasswordService {
     @InjectRepository(AppToken)
     private readonly appTokenRepository: Repository<AppToken>,
     private readonly emailService: EmailService,
+    private readonly i18nService: I18nService,
   ) {}
 
   async generatePasswordResetToken(
@@ -165,14 +166,16 @@ export class ResetPasswordService {
     const html = render(emailTemplate, { pretty: true });
     const text = render(emailTemplate, { plainText: true });
 
-    i18n.activate(locale);
+    const resetPasswordMsg = msg`Action Needed to Reset Password`;
+    const i18n = this.i18nService.getI18nInstance(locale);
+    const subject = i18n._(resetPasswordMsg);
 
     this.emailService.send({
       from: `${this.twentyConfigService.get(
         'EMAIL_FROM_NAME',
       )} <${this.twentyConfigService.get('EMAIL_FROM_ADDRESS')}>`,
       to: email,
-      subject: t`Action Needed to Reset Password`,
+      subject,
       text,
       html,
     });

packages/twenty-server/src/engine/core-modules/email-verification/services/email-verification.service.ts

@@ -1,8 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
-import { i18n } from '@lingui/core';
-import { t } from '@lingui/core/macro';
+import { msg } from '@lingui/core/macro';
 import { render } from '@react-email/render';
 import { addMilliseconds, differenceInMilliseconds } from 'date-fns';
 import ms from 'ms';
@@ -24,6 +23,7 @@ import {
   EmailVerificationExceptionCode,
 } from 'src/engine/core-modules/email-verification/email-verification.exception';
 import { EmailService } from 'src/engine/core-modules/email/email.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { UserService } from 'src/engine/core-modules/user/services/user.service';
 
@@ -37,6 +37,7 @@ export class EmailVerificationService {
     private readonly twentyConfigService: TwentyConfigService,
     private readonly userService: UserService,
     private readonly emailVerificationTokenService: EmailVerificationTokenService,
+    private readonly i18nService: I18nService,
   ) {}
 
   async sendVerificationEmail(
@@ -84,13 +85,16 @@ export class EmailVerificationService {
       plainText: true,
     });
 
-    i18n.activate(locale);
+    const emailVerificationMsg = msg`Welcome to Twenty: Please Confirm Your Email`;
+    const i18n = this.i18nService.getI18nInstance(locale);
+    const subject = i18n._(emailVerificationMsg);
+
     await this.emailService.send({
       from: `${this.twentyConfigService.get(
         'EMAIL_FROM_NAME',
       )} <${this.twentyConfigService.get('EMAIL_FROM_ADDRESS')}>`,
       to: email,
-      subject: t`Welcome to Twenty: Please Confirm Your Email`,
+      subject,
       text,
       html,
     });

packages/twenty-server/src/engine/core-modules/i18n/i18n.middleware.ts

@@ -1,21 +0,0 @@
-import { Injectable, type NestMiddleware } from '@nestjs/common';
-
-import { i18n } from '@lingui/core';
-import { type NextFunction, type Request, type Response } from 'express';
-import { APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
-
-// TODO: this should be deprecated as singleton pattern won't work: user will keep changing locales for eachothers
-@Injectable()
-export class I18nMiddleware implements NestMiddleware {
-  use(req: Request, _res: Response, next: NextFunction) {
-    const locale = req.locale;
-
-    if (locale && Object.values(APP_LOCALES).includes(locale)) {
-      i18n.activate(locale);
-    } else {
-      i18n.activate(SOURCE_LOCALE);
-    }
-
-    next();
-  }
-}

packages/twenty-server/src/engine/core-modules/i18n/i18n.module.ts

@@ -1,11 +1,5 @@
-import {
-  Global,
-  type MiddlewareConsumer,
-  Module,
-  type NestModule,
-} from '@nestjs/common';
+import { Global, Module } from '@nestjs/common';
 
-import { I18nMiddleware } from 'src/engine/core-modules/i18n/i18n.middleware';
 import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 @Global()
@@ -13,8 +7,4 @@ import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
   providers: [I18nService],
   exports: [I18nService],
 })
-export class I18nModule implements NestModule {
-  configure(consumer: MiddlewareConsumer) {
-    consumer.apply(I18nMiddleware).forRoutes('*');
-  }
-}
+export class I18nModule {}

packages/twenty-server/src/engine/core-modules/i18n/i18n.service.ts

@@ -4,7 +4,6 @@ import {
   type I18n,
   type MessageOptions,
   type Messages,
-  i18n,
   setupI18n,
 } from '@lingui/core';
 import { type APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
@@ -90,14 +89,7 @@ export class I18nService implements OnModuleInit {
       localeI18n.activate(locale);
 
       this.i18nInstancesMap[locale] = localeI18n;
-
-      // TODO: deprecate this line which is legacy as soon as we only use the i18nInstancesMap
-      // Also deprecate i18n.middleware.ts
-      i18n.load(locale, messages);
     });
-
-    // TODO: deprecate this line which is legacy as soon as we only use the i18nInstancesMap
-    i18n.activate(SOURCE_LOCALE);
   }
 
   getI18nInstance(locale: keyof typeof APP_LOCALES) {

packages/twenty-server/src/engine/core-modules/view/controllers/view.controller.ts

@@ -31,6 +31,7 @@ import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorat
 import { RequestLocale } from 'src/engine/decorators/locale/request-locale.decorator';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 import { resolveObjectMetadataStandardOverride } from 'src/engine/metadata-modules/object-metadata/utils/resolve-object-metadata-standard-override.util';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { WorkspaceMetadataCacheService } from 'src/engine/metadata-modules/workspace-metadata-cache/services/workspace-metadata-cache.service';
 
 @Controller('rest/metadata/views')
@@ -40,6 +41,7 @@ export class ViewController {
   constructor(
     private readonly viewService: ViewService,
     private readonly workspaceMetadataCacheService: WorkspaceMetadataCacheService,
+    private readonly i18nService: I18nService,
   ) {}
 
   @Get()
@@ -163,6 +165,7 @@ export class ViewController {
         const objectMetadata = objectMetadataMaps.byId[view.objectMetadataId];
 
         if (objectMetadata) {
+          const i18n = this.i18nService.getI18nInstance(locale ?? 'en');
           const translatedObjectLabel = resolveObjectMetadataStandardOverride(
             {
               labelPlural: objectMetadata.labelPlural,
@@ -174,6 +177,7 @@ export class ViewController {
             },
             'labelPlural',
             locale,
+            i18n,
           );
 
           processedName = this.viewService.processViewNameWithTemplate(

packages/twenty-server/src/engine/core-modules/view/resolvers/view.resolver.ts

@@ -36,6 +36,7 @@ import { type IDataloaders } from 'src/engine/dataloaders/dataloader.interface';
 import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 import { resolveObjectMetadataStandardOverride } from 'src/engine/metadata-modules/object-metadata/utils/resolve-object-metadata-standard-override.util';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 @Resolver(() => ViewDTO)
 @UseFilters(ViewGraphqlApiExceptionFilter)
@@ -48,6 +49,7 @@ export class ViewResolver {
     private readonly viewFilterGroupService: ViewFilterGroupService,
     private readonly viewSortService: ViewSortService,
     private readonly viewGroupService: ViewGroupService,
+    private readonly i18nService: I18nService,
     private readonly featureFlagService: FeatureFlagService,
     private readonly viewV2Service: ViewV2Service,
   ) {}
@@ -65,6 +67,7 @@ export class ViewResolver {
       });
 
       if (objectMetadata) {
+        const i18n = this.i18nService.getI18nInstance(context.req.locale);
         const translatedObjectLabel = resolveObjectMetadataStandardOverride(
           {
             labelPlural: objectMetadata.labelPlural,
@@ -76,6 +79,7 @@ export class ViewResolver {
           },
           'labelPlural',
           context.req.locale,
+          i18n,
         );
 
         return this.viewService.processViewNameWithTemplate(

packages/twenty-server/src/engine/core-modules/workspace-invitation/services/workspace-invitation.service.spec.ts

@@ -16,6 +16,7 @@ import { WorkspaceInvitationException } from 'src/engine/core-modules/workspace-
 import { WorkspaceService } from 'src/engine/core-modules/workspace/services/workspace.service';
 import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
 import { type WorkspaceMemberWorkspaceEntity } from 'src/modules/workspace-member/standard-objects/workspace-member.workspace-entity';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 import { WorkspaceInvitationService } from './workspace-invitation.service';
 
@@ -83,6 +84,14 @@ describe('WorkspaceInvitationService', () => {
             // Add other methods as needed
           },
         },
+        {
+          provide: I18nService,
+          useValue: {
+            getI18nInstance: jest.fn().mockReturnValue({
+              _: jest.fn().mockReturnValue('mocked-translation'),
+            }),
+          },
+        },
       ],
     }).compile();
 
@@ -152,6 +161,7 @@ describe('WorkspaceInvitationService', () => {
       const sender = {
         userEmail: 'sender@example.com',
         name: { firstName: 'Sender' },
+        locale: 'en',
       };
 
       jest.spyOn(service, 'createWorkspaceInvitation').mockResolvedValue({

packages/twenty-server/src/engine/core-modules/workspace-invitation/services/workspace-invitation.service.ts

@@ -3,8 +3,7 @@ import { InjectRepository } from '@nestjs/typeorm';
 
 import crypto from 'crypto';
 
-import { i18n } from '@lingui/core';
-import { t } from '@lingui/core/macro';
+import { msg } from '@lingui/core/macro';
 import { render } from '@react-email/render';
 import { addMilliseconds } from 'date-fns';
 import ms from 'ms';
@@ -23,6 +22,7 @@ import {
 } from 'src/engine/core-modules/auth/auth.exception';
 import { DomainManagerService } from 'src/engine/core-modules/domain-manager/services/domain-manager.service';
 import { EmailService } from 'src/engine/core-modules/email/email.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { OnboardingService } from 'src/engine/core-modules/onboarding/onboarding.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { UserWorkspace } from 'src/engine/core-modules/user-workspace/user-workspace.entity';
@@ -46,6 +46,7 @@ export class WorkspaceInvitationService {
     private readonly emailService: EmailService,
     private readonly onboardingService: OnboardingService,
     private readonly domainManagerService: DomainManagerService,
+    private readonly i18nService: I18nService,
   ) {}
 
   async validatePersonalInvitation({
@@ -309,12 +310,14 @@ export class WorkspaceInvitationService {
           plainText: true,
         });
 
-        i18n.activate(sender.locale);
+        const joinTeamMsg = msg`Join your team on Twenty`;
+        const i18n = this.i18nService.getI18nInstance(sender.locale);
+        const subject = i18n._(joinTeamMsg);
 
         await this.emailService.send({
           from: `${sender.name.firstName} ${sender.name.lastName} (via Twenty) <${this.twentyConfigService.get('EMAIL_FROM_ADDRESS')}>`,
           to: invitation.value.email,
-          subject: t`Join your team on Twenty`,
+          subject,
           text,
           html,
         });

packages/twenty-server/src/engine/metadata-modules/field-metadata/hooks/__tests__/before-update-one-field.hook.spec.ts

@@ -1,6 +1,5 @@
 import { Test, type TestingModule } from '@nestjs/testing';
 
-import { i18n } from '@lingui/core';
 import { type UpdateOneInputType } from '@ptc-org/nestjs-query-graphql';
 import { FieldMetadataType } from 'twenty-shared/types';
 
@@ -16,12 +15,7 @@ import { type IndexMetadataEntity } from 'src/engine/metadata-modules/index-meta
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { ObjectMetadataService } from 'src/engine/metadata-modules/object-metadata/object-metadata.service';
 import { getMockFieldMetadataEntity } from 'src/utils/__test__/get-field-metadata-entity.mock';
-
-jest.mock('@lingui/core', () => ({
-  i18n: {
-    _: jest.fn().mockImplementation((messageId) => `translated:${messageId}`),
-  },
-}));
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 // Create a type that omits id and workspaceId from UpdateFieldInput
 type UpdateFieldInputForTest = Omit<UpdateFieldInput, 'id' | 'workspaceId'>;
@@ -50,6 +44,14 @@ describe('BeforeUpdateOneField', () => {
             findOneWithinWorkspace: jest.fn(),
           },
         },
+        {
+          provide: I18nService,
+          useValue: {
+            getI18nInstance: jest.fn().mockReturnValue({
+              _: jest.fn().mockReturnValue('mocked-translation'),
+            }),
+          },
+        },
       ],
     }).compile();
 
@@ -482,9 +484,7 @@ describe('BeforeUpdateOneField', () => {
   });
 
   it('should reset locale-specific translations when they match translated defaults', async () => {
-    const translatedLabel = 'translated:msg-label';
-
-    (i18n._ as jest.Mock).mockImplementation(() => translatedLabel);
+    const translatedLabel = 'mocked-translation';
 
     const instance: UpdateOneInputType<UpdateFieldInputForTest> = {
       id: mockFieldId,

packages/twenty-server/src/engine/metadata-modules/field-metadata/hooks/before-update-one-field.hook.ts

@@ -1,6 +1,5 @@
 import { Injectable } from '@nestjs/common';
 
-import { i18n } from '@lingui/core';
 import {
   type BeforeUpdateOneHook,
   type UpdateOneInputType,
@@ -13,6 +12,7 @@ import {
   ValidationError,
 } from 'src/engine/core-modules/graphql/utils/graphql-errors.util';
 import { generateMessageId } from 'src/engine/core-modules/i18n/utils/generateMessageId';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { type FieldStandardOverridesDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-standard-overrides.dto';
 import { type UpdateFieldInput } from 'src/engine/metadata-modules/field-metadata/dtos/update-field.input';
 import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
@@ -30,6 +30,7 @@ export class BeforeUpdateOneField<T extends UpdateFieldInput>
   constructor(
     readonly fieldMetadataService: FieldMetadataService,
     readonly objectMetadataService: ObjectMetadataService,
+    private readonly i18nService: I18nService,
   ) {}
 
   async run(
@@ -289,6 +290,7 @@ export class BeforeUpdateOneField<T extends UpdateFieldInput>
     locale: keyof typeof APP_LOCALES,
   ): boolean {
     const messageId = generateMessageId(originalValue ?? '');
+    const i18n = this.i18nService.getI18nInstance(locale);
     const translatedMessage = i18n._(messageId);
 
     if (newValue !== translatedMessage) {

packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/__tests__/resolve-field-metadata-standard-override.util.spec.ts

@@ -1,20 +1,23 @@
-import { i18n } from '@lingui/core';
+import { type I18n } from '@lingui/core';
 import { SOURCE_LOCALE } from 'twenty-shared/translations';
 
 import { generateMessageId } from 'src/engine/core-modules/i18n/utils/generateMessageId';
 import { resolveFieldMetadataStandardOverride } from 'src/engine/metadata-modules/field-metadata/utils/resolve-field-metadata-standard-override.util';
 
-jest.mock('@lingui/core');
 jest.mock('src/engine/core-modules/i18n/utils/generateMessageId');
 
-const mockI18n = i18n as jest.Mocked<typeof i18n>;
 const mockGenerateMessageId = generateMessageId as jest.MockedFunction<
   typeof generateMessageId
 >;
 
 describe('resolveFieldMetadataStandardOverride', () => {
+  let mockI18n: jest.Mocked<I18n>;
+
   beforeEach(() => {
     jest.clearAllMocks();
+    mockI18n = {
+      _: jest.fn(),
+    } as unknown as jest.Mocked<I18n>;
   });
 
   describe('Custom fields', () => {

packages/twenty-server/src/engine/metadata-modules/object-metadata/hooks/__tests__/before-update-one-object.hook.spec.ts

@@ -2,7 +2,6 @@ import { BadRequestException, UnauthorizedException } from '@nestjs/common';
 import { Test, type TestingModule } from '@nestjs/testing';
 import { getRepositoryToken } from '@nestjs/typeorm';
 
-import { i18n } from '@lingui/core';
 import { type UpdateOneInputType } from '@ptc-org/nestjs-query-graphql';
 import { type Repository } from 'typeorm';
 
@@ -11,12 +10,7 @@ import { type UpdateObjectPayload } from 'src/engine/metadata-modules/object-met
 import { BeforeUpdateOneObject } from 'src/engine/metadata-modules/object-metadata/hooks/before-update-one-object.hook';
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { ObjectMetadataService } from 'src/engine/metadata-modules/object-metadata/object-metadata.service';
-
-jest.mock('@lingui/core', () => ({
-  i18n: {
-    _: jest.fn().mockImplementation((messageId) => `translated:${messageId}`),
-  },
-}));
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 
 type UpdateObjectPayloadForTest = Omit<
   UpdateObjectPayload,
@@ -47,6 +41,14 @@ describe('BeforeUpdateOneObject', () => {
             findBy: jest.fn(),
           },
         },
+        {
+          provide: I18nService,
+          useValue: {
+            getI18nInstance: jest.fn().mockReturnValue({
+              _: jest.fn().mockReturnValue('mocked-translation'),
+            }),
+          },
+        },
       ],
     }).compile();
 
@@ -511,9 +513,7 @@ describe('BeforeUpdateOneObject', () => {
   });
 
   it('should reset locale-specific translations when they match translated defaults', async () => {
-    const translatedLabel = 'translated:msg-label';
-
-    (i18n._ as jest.Mock).mockImplementation(() => translatedLabel);
+    const translatedLabel = 'mocked-translation';
 
     const instance: UpdateOneInputType<UpdateObjectPayloadForTest> = {
       id: mockObjectId,

packages/twenty-server/src/engine/metadata-modules/object-metadata/hooks/before-update-one-object.hook.ts

@@ -4,7 +4,6 @@ import {
   UnauthorizedException,
 } from '@nestjs/common';
 
-import { i18n } from '@lingui/core';
 import {
   type BeforeUpdateOneHook,
   type UpdateOneInputType,
@@ -13,6 +12,7 @@ import { type APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
 import { isDefined } from 'twenty-shared/utils';
 
 import { generateMessageId } from 'src/engine/core-modules/i18n/utils/generateMessageId';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { type ObjectStandardOverridesDTO } from 'src/engine/metadata-modules/object-metadata/dtos/object-standard-overrides.dto';
 import { type UpdateObjectPayload } from 'src/engine/metadata-modules/object-metadata/dtos/update-object.input';
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
@@ -26,7 +26,10 @@ interface StandardObjectUpdate extends Partial<UpdateObjectPayload> {
 export class BeforeUpdateOneObject<T extends UpdateObjectPayload>
   implements BeforeUpdateOneHook<T>
 {
-  constructor(readonly objectMetadataService: ObjectMetadataService) {}
+  constructor(
+    readonly objectMetadataService: ObjectMetadataService,
+    private readonly i18nService: I18nService,
+  ) {}
 
   // TODO: this logic could be moved to a policy guard
   async run(
@@ -220,6 +223,7 @@ export class BeforeUpdateOneObject<T extends UpdateObjectPayload>
     locale: keyof typeof APP_LOCALES,
   ): boolean {
     const messageId = generateMessageId(originalValue ?? '');
+    const i18n = this.i18nService.getI18nInstance(locale);
     const translatedMessage = i18n._(messageId);
 
     if (newValue !== translatedMessage) {

packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.resolver.ts

@@ -31,6 +31,7 @@ import { ObjectMetadataServiceV2 } from 'src/engine/metadata-modules/object-meta
 import { ObjectMetadataService } from 'src/engine/metadata-modules/object-metadata/object-metadata.service';
 import { objectMetadataGraphqlApiExceptionHandler } from 'src/engine/metadata-modules/object-metadata/utils/object-metadata-graphql-api-exception-handler.util';
 import { resolveObjectMetadataStandardOverride } from 'src/engine/metadata-modules/object-metadata/utils/resolve-object-metadata-standard-override.util';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { PermissionFlagType } from 'src/engine/metadata-modules/permissions/constants/permission-flag-type.constants';
 import { PermissionsGraphqlApiExceptionFilter } from 'src/engine/metadata-modules/permissions/utils/permissions-graphql-api-exception.filter';
 
@@ -47,6 +48,7 @@ export class ObjectMetadataResolver {
     private readonly beforeUpdateOneObject: BeforeUpdateOneObject<UpdateObjectPayload>,
     private readonly featureFlagService: FeatureFlagService,
     private readonly objectMetadataServiceV2: ObjectMetadataServiceV2,
+    private readonly i18nService: I18nService,
   ) {}
 
   @ResolveField(() => String, { nullable: true })
@@ -54,10 +56,13 @@ export class ObjectMetadataResolver {
     @Parent() objectMetadata: ObjectMetadataDTO,
     @Context() context: I18nContext,
   ): Promise<string> {
+    const i18n = this.i18nService.getI18nInstance(context.req.locale);
+
     return resolveObjectMetadataStandardOverride(
       objectMetadata,
       'labelPlural',
       context.req.locale,
+      i18n,
     );
   }
 
@@ -66,10 +71,13 @@ export class ObjectMetadataResolver {
     @Parent() objectMetadata: ObjectMetadataDTO,
     @Context() context: I18nContext,
   ): Promise<string> {
+    const i18n = this.i18nService.getI18nInstance(context.req.locale);
+
     return resolveObjectMetadataStandardOverride(
       objectMetadata,
       'labelSingular',
       context.req.locale,
+      i18n,
     );
   }
 
@@ -78,10 +86,13 @@ export class ObjectMetadataResolver {
     @Parent() objectMetadata: ObjectMetadataDTO,
     @Context() context: I18nContext,
   ): Promise<string> {
+    const i18n = this.i18nService.getI18nInstance(context.req.locale);
+
     return resolveObjectMetadataStandardOverride(
       objectMetadata,
       'description',
       context.req.locale,
+      i18n,
     );
   }
 
@@ -91,10 +102,13 @@ export class ObjectMetadataResolver {
     @Parent() objectMetadata: ObjectMetadataDTO,
     @Context() context: I18nContext,
   ): Promise<string> {
+    const i18n = this.i18nService.getI18nInstance(context.req.locale);
+
     return resolveObjectMetadataStandardOverride(
       objectMetadata,
       'icon',
       context.req.locale,
+      i18n,
     );
   }
 

packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/__tests__/resolve-object-metadata-standard-override.util.spec.ts

@@ -1,21 +1,24 @@
-import { i18n } from '@lingui/core';
+import { type I18n } from '@lingui/core';
 import { SOURCE_LOCALE } from 'twenty-shared/translations';
 
 import { generateMessageId } from 'src/engine/core-modules/i18n/utils/generateMessageId';
 import { type ObjectMetadataDTO } from 'src/engine/metadata-modules/object-metadata/dtos/object-metadata.dto';
 import { resolveObjectMetadataStandardOverride } from 'src/engine/metadata-modules/object-metadata/utils/resolve-object-metadata-standard-override.util';
 
-jest.mock('@lingui/core');
 jest.mock('src/engine/core-modules/i18n/utils/generateMessageId');
 
-const mockI18n = i18n as jest.Mocked<typeof i18n>;
 const mockGenerateMessageId = generateMessageId as jest.MockedFunction<
   typeof generateMessageId
 >;
 
 describe('resolveObjectMetadataStandardOverride', () => {
+  let mockI18n: jest.Mocked<I18n>;
+
   beforeEach(() => {
     jest.clearAllMocks();
+    mockI18n = {
+      _: jest.fn(),
+    } as unknown as jest.Mocked<I18n>;
   });
 
   describe('Custom objects', () => {
@@ -41,6 +44,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('My Custom');
@@ -68,6 +72,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'description',
         undefined,
+        mockI18n,
       );
 
       expect(result).toBe('Custom Description');
@@ -95,6 +100,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'icon',
         SOURCE_LOCALE,
+        mockI18n,
       );
 
       expect(result).toBe('custom-icon');
@@ -118,6 +124,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'icon',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('override-icon');
@@ -148,6 +155,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'labelSingular',
           'fr-FR',
+          mockI18n,
         ),
       ).toBe('Libellé traduit');
       expect(
@@ -155,6 +163,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'labelPlural',
           'fr-FR',
+          mockI18n,
         ),
       ).toBe('Libellés traduits');
       expect(
@@ -162,6 +171,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'description',
           'fr-FR',
+          mockI18n,
         ),
       ).toBe('Description traduite');
     });
@@ -191,6 +201,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('Standard Label');
@@ -220,6 +231,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'description',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('Standard Description');
@@ -250,6 +262,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         undefined,
+        mockI18n,
       );
 
       expect(result).toBe('Standard Label');
@@ -277,6 +290,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'labelSingular',
           SOURCE_LOCALE,
+          mockI18n,
         ),
       ).toBe('Overridden Label');
       expect(
@@ -284,6 +298,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'labelPlural',
           SOURCE_LOCALE,
+          mockI18n,
         ),
       ).toBe('Overridden Labels');
       expect(
@@ -291,6 +306,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'description',
           SOURCE_LOCALE,
+          mockI18n,
         ),
       ).toBe('Overridden Description');
       expect(
@@ -298,6 +314,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
           objectMetadata,
           'icon',
           SOURCE_LOCALE,
+          mockI18n,
         ),
       ).toBe('overridden-icon');
     });
@@ -322,6 +339,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('Standard Label');
@@ -339,10 +357,14 @@ describe('resolveObjectMetadataStandardOverride', () => {
         },
       };
 
+      mockGenerateMessageId.mockReturnValue('generated-message-id');
+      mockI18n._.mockReturnValue('generated-message-id');
+
       const result = resolveObjectMetadataStandardOverride(
         objectMetadata,
         'labelSingular',
         SOURCE_LOCALE,
+        mockI18n,
       );
 
       expect(result).toBe('Standard Label');
@@ -367,6 +389,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(mockGenerateMessageId).toHaveBeenCalledWith('Standard Label');
@@ -393,6 +416,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('Standard Label');
@@ -423,6 +447,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'fr-FR',
+        mockI18n,
       );
 
       expect(result).toBe('Translation Override');
@@ -447,6 +472,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         SOURCE_LOCALE,
+        mockI18n,
       );
 
       expect(result).toBe('Source Override');
@@ -471,6 +497,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         'de-DE',
+        mockI18n,
       );
 
       expect(result).toBe('Auto Translated Label');
@@ -496,6 +523,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         undefined,
+        mockI18n,
       );
 
       expect(result).toBe('Source Override');
@@ -520,6 +548,7 @@ describe('resolveObjectMetadataStandardOverride', () => {
         objectMetadata,
         'labelSingular',
         undefined,
+        mockI18n,
       );
 
       expect(result).toBe('Auto Translated Label');

packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/resolve-object-metadata-standard-override.util.ts

@@ -1,4 +1,4 @@
-import { i18n } from '@lingui/core';
+import { type I18n } from '@lingui/core';
 import { isNonEmptyString } from '@sniptt/guards';
 import { type APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
 import { isDefined } from 'twenty-shared/utils';
@@ -18,6 +18,7 @@ export const resolveObjectMetadataStandardOverride = (
   >,
   labelKey: 'labelPlural' | 'labelSingular' | 'description' | 'icon',
   locale: keyof typeof APP_LOCALES | undefined,
+  i18nInstance: I18n,
 ): string => {
   const safeLocale = locale ?? SOURCE_LOCALE;
 
@@ -52,7 +53,7 @@ export const resolveObjectMetadataStandardOverride = (
   }
 
   const messageId = generateMessageId(objectMetadata[labelKey] ?? '');
-  const translatedMessage = i18n._(messageId);
+  const translatedMessage = i18nInstance._(messageId);
 
   if (translatedMessage === messageId) {
     return objectMetadata[labelKey] ?? '';

packages/twenty-server/src/engine/workspace-manager/workspace-cleaner/services/cleaner.workspace-service.ts

@@ -1,8 +1,7 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
-import { i18n } from '@lingui/core';
-import { t } from '@lingui/core/macro';
+import { msg } from '@lingui/core/macro';
 import { render } from '@react-email/render';
 import { differenceInDays } from 'date-fns';
 import {
@@ -16,6 +15,7 @@ import { In, Repository } from 'typeorm';
 import { BillingSubscription } from 'src/engine/core-modules/billing/entities/billing-subscription.entity';
 import { SubscriptionStatus } from 'src/engine/core-modules/billing/enums/billing-subscription-status.enum';
 import { EmailService } from 'src/engine/core-modules/email/email.service';
+import { I18nService } from 'src/engine/core-modules/i18n/i18n.service';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { UserWorkspace } from 'src/engine/core-modules/user-workspace/user-workspace.entity';
 import { UserService } from 'src/engine/core-modules/user/services/user.service';
@@ -50,6 +50,7 @@ export class CleanerWorkspaceService {
     private readonly twentyORMGlobalManager: TwentyORMGlobalManager,
     @InjectRepository(UserWorkspace)
     private readonly userWorkspaceRepository: Repository<UserWorkspace>,
+    private readonly i18nService: I18nService,
   ) {
     this.inactiveDaysBeforeSoftDelete = this.twentyConfigService.get(
       'WORKSPACE_INACTIVE_DAYS_BEFORE_SOFT_DELETION',
@@ -125,14 +126,16 @@ export class CleanerWorkspaceService {
     const html = render(emailTemplate, { pretty: true });
     const text = render(emailTemplate, { plainText: true });
 
-    i18n.activate(workspaceMember.locale);
+    const workspaceDeletionMsg = msg`Action needed to prevent workspace deletion`;
+    const i18n = this.i18nService.getI18nInstance(workspaceMember.locale);
+    const subject = i18n._(workspaceDeletionMsg);
 
     this.emailService.send({
       to: workspaceMember.userEmail,
       from: `${this.twentyConfigService.get(
         'EMAIL_FROM_NAME',
       )} <${this.twentyConfigService.get('EMAIL_FROM_ADDRESS')}>`,
-      subject: t`Action needed to prevent workspace deletion`,
+      subject,
       html,
       text,
     });