[FR] Text translation

### Description

I tend to draft in English because it is the most comfortable language to think in. But then I often need to publish things in more than just English, for me notably French and/or German.

It would be _really_ cool to be able to do translation work inside appflowy.
This could be as simple as adding an AI prompt "translate to..." and then asking for the language.

Or it could be as involved as integrating a possibility to add a deepl API token, and use their REST APIs.

### Impact

Anyone who needs to write in one language, then translate to another, would benefit. This could be for translation of blog content, or for academics who draft in their native language but need to publish (or re-publish) in English.

### Additional Context

The deepl "write" service has a neat UI for this. However, it is currently non-persistent, i.e. as soon as the tab is closed/suspended it loses the state. This is no good for longer writing.




Essentially, I'd be looking for something that gives the an automatic translation, then lets me "massage" the text until it feels right.