LLMプロバイダーがdiscourse-translateプラグインの翻訳者として機能できるようにする

This is completed now @elmstedt , see:

We are still improving the feature, recently @nat added indexing support to Google for multi lingual communities :open_mouth:

@keegan is working on UI to see translation progress.

:hugs:

「いいね!」 2