@Max: Sure!
Here the complete folder nodeeditor who is working! (so with 2 "French dictionnaries" as shown on my image above inside the file lang.js)
http://we.tl/TwsT35rm6z till 12 may 2016

Of course all translations of nodes and other things are not yet made! (All is in Wip building)
but with this yet made and this curious lang.js all works fine in French!