[language] AI Answer to support more languages

AI-based features seem to support some languages but it's not guaranteed for many of them. cc https://help.front.com/en/articles/914304#prerequisites

I'd be great if features like AI answer for chat, Suggested replies could leverage knowledge bases in more languages.

AI Answers: supports content in English-only or French-only

• External Knowledge Source for AI Answers: English-only OR French-only content

• Suggested Replies supports English. You must have a Front Knowledge Base that is published in English for this feature to work.