Bug#686817: grub-pc: Add option to change keyboard layout

[Patrick Schleizer]

This bug is assigned to grub-pc (legacy BIOS). grub-efi (and probably 
others) are however equally affected. Should this bug therefore be 
re-assigned to grub?

I haven't found any bug report for grub-efi.
Is this bug report the reason why non-US keyboard layouts result in 
broken password prompts for installations using calamares which sets up 
encrypted /boot?

Discussed upstream at calamares:
https://github.com/calamares/calamares/issues/1203