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/docs-i18n-pull.yaml

@@ -24,7 +24,7 @@ on:
   pull_request:
     paths:
       - 'packages/twenty-docs/**'
-      - 'crowdin.yml'
+      - 'crowdin-docs.yml'
       - '.github/workflows/docs-i18n-pull.yaml'
 
 concurrency:
@@ -96,12 +96,14 @@ jobs:
           create_pull_request: false
           skip_ref_checkout: true
           dryrun_action: false
+          config: 'crowdin-docs.yml'
           # Only download languages supported by Mintlify (see supported-languages.ts)
           # Using multiple -l flags since download_language only accepts single language
           download_translations_args: '-l fr -l ar -l cs -l de -l es -l it -l ja -l ko -l pt -l ro -l ru -l tr -l zh-CN'
         env:
           GITHUB_TOKEN: ${{ github.token }}
-          CROWDIN_PROJECT_ID: '1'
+          # Docs translations project
+          CROWDIN_PROJECT_ID: '2'
           CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}
 
       - name: Fix file permissions