Multi-language support for Flutter apps using ARB files and code generation.

• Configure pubspec.yaml with flutter_localizations and intl, then define an l10n.yaml file to enable the gen-l10n code generator
• Store localized strings in Application Resource Bundle (.arb) JSON files; the template file defines all keys, and locale-specific files provide translations
• Integrate localizations into MaterialApp or CupertinoApp by adding AppLocalizations.delegate and platform-specific delegates to localizationsDelegates, then access strings via AppLocalizations.of(context)
• Support dynamic content with placeholders, plurals, selects, and formatted dates/numbers using ICU message syntax in ARB metadata
• iOS requires additional bundle configuration in Xcode to register supported languages with the App Store