Keyboard shortcuts use QWERTY mapping instead of the configured keyboard layout

Starting from Tails 0.22~rc1 in French, for example in gedit:

Ctrl+A on a French AZERTY keyboard closes gedit (as if it was Ctrl+Q)
Ctrl+Q on a French AZERTY keyboard selects all (as if it was Ctrl+A)
Ctrl+Z on a French AZERTY keyboard closes the current file (as if it was Ctrl+W)
Ctrl+W on a French AZERTY keyboard does undo (as if it was Ctrl+Z)

This does happen as well Iceweasel and OpenOffice so it looks like a globel input method problem.

Feature Branch: bugfix/6478

Original created by @sajolida on 6478 (Redmine)

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