fix: standard object metadata override (#13215)

# Issue

- fix #13156, related #13105

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

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

@@ -7,7 +7,7 @@ import { APP_LOCALES, SOURCE_LOCALE } from 'twenty-shared/translations';
 @Injectable()
 export class I18nMiddleware implements NestMiddleware {
   use(req: Request, res: Response, next: NextFunction) {
-    const locale = req.headers['x-locale'] as keyof typeof APP_LOCALES;
+    const locale = req.locale;
 
     if (locale && Object.values(APP_LOCALES).includes(locale)) {
       i18n.activate(locale);

packages/twenty-server/src/engine/core-modules/i18n/types/i18n-context.type.ts

@@ -1,8 +1,6 @@
 import { APP_LOCALES } from 'twenty-shared/translations';
 export type I18nContext = {
   req: {
-    headers: {
-      'x-locale': (typeof APP_LOCALES)[keyof typeof APP_LOCALES] | undefined;
-    };
+    locale: keyof typeof APP_LOCALES;
   };
 };