feat(i18n): add Russian (ru) language support

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Summary

This PR adds full Russian (ru) language support to @plane/i18n.

Changes

• packages/i18n/src/locales/ru/translations.json — new file with 300+ translations covering:
  • General UI (buttons, actions, states)
  • Profile & security settings
  • Themes (light, dark, custom)
  • Issues, priorities, assignees, labels
  • Projects, cycles, modules, pages
  • Workspaces, invitations, favorites
  • Notifications (email, mentions, state changes)
• packages/i18n/src/constants/language.ts — added { label: "Русский", value: "ru" } to SUPPORTED_LANGUAGES
• packages/i18n/src/store/index.ts — added dynamic import of ru locale in loadTranslations()

Why

Russian is spoken by ~170M people and is the primary language of a major market. The browser navigator.language for Russian users returns "ru", which the existing getBrowserLanguage() logic already handles — it will auto-detect and apply the locale once the translation file is present.

Testing

• Set browser language to Russian → Plane UI switches automatically
• Manually select "Русский" in the Language dropdown (Profile → Appearance)
• All translated strings display correctly with no fallback to English keys

Made with Cursor

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