feat: translate the sunset message to all supported languages

[grunch]

Summary

Translates the sunset notice (#911, #912) into the 8 remaining bot languages: German, French, Italian, Portuguese, Russian, Ukrainian, Korean, and Farsi. Until now those users got the English fallback; each locale now has a native sunset message.

All non-Spanish locales link the English announcement (https://x.com/negrunch/status/2086899005355704703) and the English video tutorial (https://www.youtube.com/watch?v=Lnyjgecfd_w), matching the language split defined in #911/#912.

Test plan

• All 10 locale files parse as valid YAML with the sunset key present
• npm test — 233 passing; tests/bot/sunset.spec.ts now asserts every locale contains the sunset key with the correct announcement, tutorial, and Mostro links
• npm run lint clean

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5418c8d5-ef0e-469e-9e6f-bb6acb7097bb

📥 Commits

Reviewing files that changed from the base of the PR and between c8d34fe and 18f6aea.

📒 Files selected for processing (9)

• locales/de.yaml
• locales/fa.yaml
• locales/fr.yaml
• locales/it.yaml
• locales/ko.yaml
• locales/pt.yaml
• locales/ru.yaml
• locales/uk.yaml
• tests/bot/sunset.spec.ts

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