Add Croatian (hr) translations for all email templates:
- email-validation: email verification request
- rent-due: rent payment due notification
- util-bills-due: utility bills notification
All templates maintain same structure and styling as English versions.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
