How to change QWERTY to AZERTY an Apple keyboard?

Hello everybody,

Without any explanation my keyboard is now configured in QWERTY except the key on it which are in AZERTY!!!

I do not understand what is happening?

A few minutes ago, I didn't understand why my password don't work, finally it was because when I pressed A the keyboard understand Q...

Is anybody could help, me? currently I write this text with my old keyboard.

Great thank's for your help.