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

[Peter Keel]

Hi

This has become more important with disk encryption. 
- Put grub on an encrypted disk
- Add GRUB_ENABLE_CRYPTODISK=y to /etc/default/grub
  (update-grub says "1", but that's a bug, it must be "y". 
  Another bug: the above parameter is not even documented).
- wonder why your encrypted disk cannot be found, because
  grub mangled your password with the wrong keyboard-layout.
Since it's not that a huge task, please fix it.

-- Seegras
-- 
"Those who give up essential liberties for temporary safety deserve 
neither liberty nor safety." -- Benjamin Franklin
"It's also true that those who would give up privacy for security are 
likely to end up with neither." -- Bruce Schneier