feat(i18n): fix translation QA issues and add automation (#16756)

## Summary

This PR fixes translation QA issues and adds automation to prevent
future issues.

### Translation Fixes
- Fixed **escaped Unicode sequences** in translations (e.g.,
`\u62db\u5f85` → `招待`)
- Removed **corrupted control characters** from .po files (null bytes,
invalid characters)
- Fixed **missing/incorrect placeholders** in various languages
- Deleted **35 problematic translations** via Crowdin API that had
variable mismatches

### New Scripts (in `packages/twenty-utils/`)
- `fix-crowdin-translations.ts` - Auto-fixes encoding issues and syncs
to Crowdin
- `fix-qa-issues.ts` - Fixes specific QA issues via Crowdin API
- `translation-qa-report.ts` - Generates weekly QA report from Crowdin
API

### New Workflow
- `i18n-qa-report.yaml` - Weekly workflow that creates a PR with
translation QA issues for review

### Other Changes
- Moved GitHub Actions from `.github/workflows/actions/` to
`.github/actions/`
- Fixed `date-utils.ts` to avoid nested `t` macros in plural expressions
(root cause of confusing placeholders)

### QA Status After Fixes
| Category | Count | Status |
|----------|-------|--------|
| variables | 0 ✅ | Fixed |
| tags | 1 | Minor |
| empty | 0 ✅ | Fixed |
| spaces | 127 | Low priority |
| numbers | 246 | Locale-specific |
| special_symbols | 268 | Locale-specific |

.github/workflows/ci-front.yaml

@@ -45,7 +45,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - name: Diagnostic disk space issue
         run: df -h
       - name: Front / Write .env
@@ -53,7 +53,7 @@ jobs:
       - name: Front / Build storybook
         run: npx nx storybook:build twenty-front
       - name: Save storybook build cache
-        uses: ./.github/workflows/actions/save-cache
+        uses: ./.github/actions/save-cache
         with:
           key: ${{ env.STORYBOOK_BUILD_CACHE_KEY_FOR_SAVE_ACTION }}
   front-sb-test:
@@ -74,11 +74,11 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - name: Install Playwright
         run: cd packages/twenty-front && npx playwright install
       - name: Restore storybook build cache
-        uses: ./.github/workflows/actions/restore-cache
+        uses: ./.github/actions/restore-cache
         with:
           key: ${{ env.STORYBOOK_BUILD_CACHE_KEY_FOR_RESTORE_ACTION }}
       - name: Front / Write .env
@@ -107,7 +107,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - uses: actions/download-artifact@v4
         with:
           pattern: coverage-artifacts-${{ matrix.storybook_scope }}-${{ github.run_id }}-*
@@ -132,9 +132,9 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - name: Restore storybook build cache
-        uses: ./.github/workflows/actions/restore-cache
+        uses: ./.github/actions/restore-cache
         with:
           key: ${{ env.STORYBOOK_BUILD_CACHE_KEY }}
       - name: Front / Write .env
@@ -165,24 +165,24 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - name: Restore ${{ matrix.task }} cache
         id: restore-task-cache
-        uses: ./.github/workflows/actions/restore-cache
+        uses: ./.github/actions/restore-cache
         with:
           key: ${{ env.TASK_CACHE_KEY }}
       - name: Reset .env
-        uses: ./.github/workflows/actions/nx-affected
+        uses: ./.github/actions/nx-affected
         with:
           tag: scope:frontend
           tasks: reset:env
       - name: Run ${{ matrix.task }} task
-        uses: ./.github/workflows/actions/nx-affected
+        uses: ./.github/actions/nx-affected
         with:
           tag: scope:frontend
           tasks: ${{ matrix.task }}
       - name: Save ${{ matrix.task }} cache
-        uses: ./.github/workflows/actions/save-cache
+        uses: ./.github/actions/save-cache
         with:
           key: ${{ steps.restore-task-cache.outputs.cache-primary-key }}
   front-build:
@@ -202,7 +202,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
       - name: Front / Write .env
         run: npx nx reset:env twenty-front
       - name: Build frontend