Hi @Guillaume!
The translations from Poeditor were imported, but are marked as ‘needs editing’ now as the source strings have changed. You can access them here.
Please let me know what you think would be needed to set and document these standards. Having a style guide would really be helpful in the future when there are more people involved.
Re: doing it by yourself. We’ll continue promoting this program and we’ll hopefully get to a point where we have a group of people helping out. So far, we have another community member who expressed interest to help with the French translations. I’m hopeful we can get more support in the future!
Thanks for contributing! 
Cheers,
Faye