fix: photo upload issues with file limit and date formatting

- Add 20-file limit validation to PhotoUpload component
- Prevent Multer "Unexpected field" errors by enforcing client-side limit
- Fix JSON parsing error in dateFormatter when value is already an object
- Add missing translation keys for upload error messages
- Handle both string and object values for date format settings

These fixes resolve the 400 error when uploading more than 20 files
and the "Unexpected token o in JSON" error during email queue creation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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