Change a wording and fix a typo in the po header, in Japanese translation.
Updating to standards version 3.9.6.
Fixing typo in warning message.
Dropping empty German manpage translations.
Releasing debian version 4.0.1-1.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Merge remote-tracking branch 'live-systems/debian' into debian