add action to translate readme

[pelikhan]

This pull request configure AI-generated translations for french (only lessons and readme) using github actions and github models. Large files are still a bit of a problem, good start.

• the github action triggers on main when markdown files are modified.
• it performs as much translations as possible and pushes the result into main

[pelikhan]

First iteration added. Some of the prompts are reaching 16k tokens and hitting the upper limit. Chunking documents will certainly help with this.

[sinedied]

Reviewed french translations and it's quite good!

Few questions though:

• Is there a global config file that we can use to set global translations rules, like for example avoid translating specific words?
• Is the cache shared between file, so an exact same paragraph in different files would be translated the same, for consistency? (and less token usage 🙂 )

[pelikhan]

• Is there a global config file that we can use to set global translations rules, like for example avoid translating specific words?

The tool supports an "instructions.md" file that gets injected into the prompt.

• Is the cache shared between file, so an exact same paragraph in different files would be translated the same, for consistency? (and less token usage 🙂 )

The cache is repo wide so if two strings match, they will have the same translation. We could also percolate a translation corpus in the future and use it as a template.