I'll try to check this today later at home and see how hard it'd be to translate it :-)
So I took a look at the source and all the text seems to be integrated through code and not images. So I can send you a spreadsheet on Thursday with all the text, you can translate that to French and I'll implement it. Send me a message to hi.ludipe@gmail.com and I'll get you the spreadsheet once it's ready :-)