Adds the ability to translate help center articles to other languages using Captain's LLM infrastructure. Translated articles are created as drafts linked to the source article.
Fixes
https://linear.app/chatwoot/issue/CW-6901/translate-article-to-another-language
**How to test**
1. Navigate to Help Center → Articles for a portal with multiple locales
2. Click the three-dot menu on any article → "Translate"
3. Select a target language and category → click Translate
4. Switch to the target locale — the translated article appears as a
draft
5. Try translating the same article again — a warning shows the existing
translation with a link to open it in a new tab
6. Click "Overwrite and translate" to replace the existing translation
https://github.com/user-attachments/assets/1d2e991b-f0ac-403a-bcc1-2181b5731ea4
