OpenWebGIS with French interface is available here.
But since I can not wait and want to experiment as soon as possible with the interface in other languages, I translated the interface from English into French with the help of automatic translation (https://translate.google.com). Once again I draw your attention: the translation has been done automatically, so it certainly is full of errors and inaccuracies, but since this is an experiment, I ask not to judge strictly and help me with this translation.
This could be interesting both for software developers, and for all the rest.
OpenWebGIS avec interface en français est disponible ici.