l10n: de.po: translate 22 new messages

Translate 22 new messages came from git.pot
updates in 9306b5b (l10n: Update git.pot (3 new,
6 removed messages)), fe52cd6 (l10n: Update git.pot
(14 new, 3 removed messages)) and f9472e3
(l10n: Update git.pot (5 new, 1 removed messages)).

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Reviewed-by: Michael J Gruber <git@drmicha.warpmail.net>

Author: ralfth