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/i18n-pull.yaml

@@ -46,7 +46,7 @@ jobs:
           git checkout -B i18n origin/i18n || git checkout -b i18n
 
       - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
+        uses: ./.github/actions/yarn-install
 
       - name: Build twenty-shared
         run: npx nx build twenty-shared
@@ -89,8 +89,10 @@ jobs:
           create_pull_request: false
           skip_ref_checkout: true
           dryrun_action: false
+          config: 'crowdin-app.yml'
         env:
           GITHUB_TOKEN: ${{ github.token }}
+          # App translations project
           CROWDIN_PROJECT_ID: '1'
           CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}
 
@@ -99,6 +101,12 @@ jobs:
       - name: Fix file permissions
         run: sudo chown -R runner:docker .
 
+      # Fix encoding issues (escaped Unicode like \u62db -> 招) and push fixes back to Crowdin
+      - name: Fix translation encoding and sync to Crowdin
+        run: npx ts-node packages/twenty-utils/fix-crowdin-translations.ts
+        env:
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}
+
       - name: Compile translations
         id: compile_translations
         # Because we have set English as a fallback locale, this condition does not work anymore