I don't have much to add, except a confirmation of the issue being in Deb/testing. I have the exact same issue, it confuses the users to see the American flag and "us" right next to "Clavier" (keyboard in French), everything else is in French. Also note, if the user tries to chose their keyboard layout before typing, they have no other options, just "us".
Debian testing/Buster 10.0 Cheers, -- Emmanuel Revah
