Add a script to localize the documentation using GPT

[fflorent]

In order to:

• offer machine translations for a new language (which would be then reviewed and adapted by human in GitLocalize);
• and offer a machine translations for new pages;

It would be neat to create a script that would query GPT for a translation and put the result in the target language folder.

The script would expect an api key.

[fflorent]

I take this issue, I managed to create a script that I can clean up and reuse for that purpose.

[fflorent]

We may offer a machine translation to people wanting to translate and let them fix translation issues they find.

This way, we may not rely on Git Localize anymore.