The default controls settings show the following movement keys:
Strafe Left: A
Strafe Right: D
Walk Backwards: S
Walk Forwards: W

While using AZERTY keyboards those aren't the correct corresponding keys, though they are setup right by default (it is just not displayed correctly in the settings). Here is what it should be:
Strafe Left: Q
Strafe Right: D
Walk Backwards: S
Walk Forwards: Z

Note that strafe right (D) and Walk Backwards (S) is correct.