Yes but I'm just the translator of Plus!, not of its plugins
I guess that making a plugin available in several languages is not that easy (or maybe boring
) for the developers, and the decision is up to them. Though it obviously would be useful for people who don't understand english.. Maybe you should try to submit this idea in the Plugins forum, more people would read it
Nonetheless, if you want to help with the french translation of Plus!, then wait for an answer of Patchou