feat(desktop): added Russian language

[ponkalapon]

Summary

• added Russian (ru) locale to Hermes Desktop

[zombopanda]

🚨 Russian imperialism alert: this change claims that the Ukrainian, Belarusian, and Kazakh languages ​​are actually Russian.

[teknium1]

Thanks for the Russian Desktop locale contribution. Current main still lacks ru: apps/desktop/src/i18n/catalog.ts:7-11 registers only en, zh, zh-hant, and ja; apps/desktop/src/i18n/types.ts:8 likewise excludes it. The linked maintainer triage on #53643 identifies this PR as the earliest canonical member of the duplicate cluster.

Problems

• apps/desktop/src/i18n/languages.ts:83-85 maps be, uk, and kk to Russian. Belarusian, Ukrainian, and Kazakh are distinct languages; these aliases should not select ru.
• The diff changes no tests. Current coverage validates aliases, persistence, and runtime text for existing locales in apps/desktop/src/i18n/languages.test.ts:6-42, context.test.tsx:187-209, and runtime.test.ts:31-47; add equivalent ru/ru-RU coverage.

Suggested changes

• Keep only Russian language tags in the ru alias set.
• Add normalization, config-persistence, and runtime-translation tests for Russian.
• Salvage the semantic changes against current i18n files without the whole-file line-ending rewrites.

Automated hermes-sweeper review.

[teknium1]

be, uk, and kk are Belarusian, Ukrainian, and Kazakh rather than Russian. Please remove these aliases so configuring one of those language tags does not silently select the Russian UI.

[gramizor]

@ponkalapon, я подготовил продолжение вашего PR поверх feat/ru-i18n: ponkalapon#1

Ветка синхронизирована с current main, закрывает Russian Desktop i18n и проходит проверки. Upstream locale-PR не создавал — исходный #40701 и ваше авторство сохранены.