- Fix htmlspecialchars() receiving arrays instead of strings
- Add proper type checking for string, array, and other types
- Convert arrays to JSON for safe template rendering
- Remove unused German and French language files
- Add getAvailableLanguages() method to scan lang directory automatically
- Add getNativeLanguageName() method for proper language display names
- Enhance SimpleTemplate engine to support array iteration with {{#array}} syntax
- Update header template to use dynamic language dropdown with native names
- Add German (de.php) and French (fr.php) language files as examples
- Fix search input text color to use black text for better visibility
- Languages now appear automatically when added to engine/lang/ without code changes