Hello,
Sorry to hear you are having issues. For Groupy please refer screenshot below.
For Start11, its a little more work. You will need to go to language folder in Start11 install directory : "C:\Program Files (x86)\Stardock\Start11\lang" Look for "fr.lng" for France language. Rename it to something like "fr.xxx". Restart Start11, since it can not find the "fr.lng" it will default back to English.
Thank you.
Basj,
Stardock Community Assistant.