We have some decent french and other EU traffic on our tube site.
Unfortunately no one of our staff knows french, so we have put aff ads and have geolocalized the site to talk in french too. That works ok for us.
In most cases having french traffic doesn't mean the company/webmaster that runs the site knows french at all. It just turned our site has become known in France due to absolutely unknown reason
Said that, you should translate your program to english too, so webmasters that have french traffic but don't know french can join and promote you.