Pour la version francaise, les dialogues ne sont pas syncro avec l'animation(video) des personnages. Aussi non tout le reste tourne normalement... conseils ?

You'd better take this question to the Witcher 3 subforum, as this particular forum is about The Witcher 2 and many of the people in here don't even own Wild Hunt.

If you really need to pose the question in French, I'd also advise you to post on the French GOG General forum, as the subforums tend to be English-only.