Frontend:
- Add translate button click handler in submission-modal-enhanced.js
- Display loading state during translation (⏳ Translating...)
- Update French textarea with translated content
- Auto-update word counts after translation
- Show success message with DeepL attribution
Backend:
- Add POST /api/submissions/:id/translate endpoint
- Integrate Translation.service (DeepL)
- Save translations to SubmissionTracking.documents
- Mark translations as 'translatedBy: deepl', 'approved: false'
- Return translated text with caching metadata
Complete Translation Flow:
1. User clicks 'Translate EN → FR' button
2. Frontend sends English text to /api/submissions/:id/translate
3. Backend calls DeepL API via Translation.service
4. Translation cached for 24 hours
5. Result saved to submission.documents[docType].versions[]
6. French textarea populated with translation
7. User can review/edit before saving submission
Next: Configure DEEPL_API_KEY in .env to enable translations
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