feat: add locale-aware date formatting and bump version}
- Bump version to v2026.4.284 (package.json) and build refs to v2026.4.283 - Add formatDateLong() method with localized month names for 30 languages - Update formatDate() to use IntlDateFormatter when available for locale-aware medium date/time formatting - Register format_date_long Twig filter and store current_lang in app container - Replace hardcoded English date format in commits-list.twig with format_date_long filter - Add static $monthNames array with language-specific month names and date format patterns (Hungarian, CJK, German, etc.)