Content manager in English

I feel like I’m in anguish. I am French. I’ve been downloading Flight Simulator for over 12 hours. So far, I’ve downloaded 60GB. I bought the game on Steam. What bothers me is that the Content Manager’s screen is in English with “Welcome, set your experience” in title. Yet I saw screen pictures of French users who had this screen in French. I wouldn’t want to end up with a version of the game in English with no possibility of changing the language. Have you encountered this problem? Thank you in advance for your answers.