Added 71+ language support
Added to Version 1.20 section:
- Comprehensive language selection system with 71+ language support
- Native language names with Unicode flag emojis
- Validation-based language switching (changes apply only on confirmation)
- Complete string externalization with translations for all supported languages
- Persistent language preferences that survive app restarts
- Full application restart mechanism for proper locale switching
- Custom dropdown styling with white background and zebra blue outline
- Improved settings UI with button reordering
- Comprehensive locale management through LocaleHelper utility
- Enhanced user experience with explicit validation requirements