Can Yo!Kart back-end and front-end work in French?
Yes, the back-end and front-end of Yo!Kart can work in French (or any other language). Also the store admin has an option to run the back-end and front-end in 2 different languages. E.g.: English at the back-end and French at the front-end.
Moreover, Yo!Kart comes with multilingual functional, thereby allowing store owner to run his/her store in more than one language.