There is something wrong somewhere
That works fine for the "Elephant" but not for the "Plus"
All stays in English! Of course i change the language in the Options!
Elephant
​moi.ui.createDialog( 'moi://appdata/nodeeditor/index.html', 'resizeable,defaultWidth:680,defaultHeight:420', moi.ui.mainWindow );

NodeEditorPlus
var theme = 'Default'; /* Theme options: Default,Light,SkyBlue,Autumn,Lavender */
var language = 'FR'; /* Language options: EN,RU,FR */
moi.ui.createDialog( 'moi://appdata/NodeEditorPlus/index.html?scheme='+theme+'&lang='+language+'', 'resizeable,defaultWidth:870,defaultHeight:480', moi.ui.mainWindow );

Ok Found : I must write var language = 'FR'; and not var language = 'EN'; inside the 3 lines above! :)

And of course I must now add all that is not present in the "Lang.js" like "Interpolate" for "Interpoler" etc...

Works like a charm!

Need some time for modify, add, verify, complete all things! :)