Check the addon folder/localization/fr.lua
Here are the French strings.
Compare them to en.lua to see if some are missing.
You need to compare the string "keys" (example: "Welcome_NoSupport") in this table:
Code:
ResourceBundle.fr["Welcome_NoSupport"]
The value is the translated text then, e.g. "Active profil 1"
If you want to continue the addon try to contact the author. If he does not respond write a PM to "Dolby" here on esoui.com and ask if he will add you to the team.