Adds two new fields to user settings form:
- Town field: Text input for city/town (required when 2D code enabled)
- Currency field: Select dropdown with ISO 4217 currency codes (EUR default)
Updates:
- Database schema: Added town and currency fields to UserSettings
- Validation: Both fields required when 2D code is enabled
- Form UI: Added input fields with proper validation and error handling
- Translations: Added Croatian and English labels and error messages
- Currency options: 36 ISO 4217 codes with EUR at top as default
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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