Keyboard layout selection before entering credentials

[wessel-novacustom]

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Currently, the keyboard layout is US. However, a lot of users actually have a different keyboard layout, like AZERTY (French) and QWERTZ (German).

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Before entering credentials, the user should be prompted to select the keyboard layout:

• QWERTY (US)
• AZERTY (FR)
• QWERTZ (DE)
• Other keyboard layout ...
  - - List with all other possible keyboard layouts.

[tlaurion]

See #555