Feat: Add Launcher Localization support (i18n) & Russian language

[Demitry235]

I know this might not be a priority right now, but I had some free time and decided to implement proper localization support for the Launcher.

Changes:

• Launcher/pubspec.yaml: Added flutter_localizations, intl dependencies and enabled generate: true.
• Launcher/l10n.yaml: Created config file for the generator.
• Launcher/lib/l10n/: Created directory with ARB files:
  • app_en.arb (Main template)
  • app_ru.arb (Russian translation)
  • app_de.arb, app_fr.arb, etc. (Placeholders copied from English for future translations).
• Launcher/lib/main.dart: Connected localization delegates, defined supported locales, and implemented font switching logic (BattlefrontUI for English, BattlefrontGlobal/IBM Plex Mono for others to support special characters).
• Launcher/lib/features/settings/screens/language_and_accessibility.dart: Refactored the settings section: added a proper Language Selector menu and support for locale switching.

Known Issues:

• Currently, all languages except Russian and English are placeholders using English strings. They are ready for translation.

Video:

KyberRuVid.mp4

P.S. I apologize for the unfortunate fork name. I thought GitHub allowed multiple forks. I have some concerns about model.dart, and I hope I haven't messed up anything unnecessary; at least it runs :)

[Twig6943]

is this going to be merged? if so I'll start on the turkish localization