[AI Translations] Preserve manual translations when enabling automatic AI translation

I want to be able to enable automatic AI translation for my help center articles without overwriting my existing manual translations.

Currently, enabling auto-translation updates all articles to match the base language, which causes us to lose our previous manual work.

It would be great to have a way to "protect" existing translations or only enable auto-translation for new content/updates going forward.

i.e. selecting articles & collections that won’t be translated or having a manual way to trigger the generation of translated articles per article