l10n: de.po: translate 68 new messages

Translate 68 new messages came from git.pot update in 727b957
(l10n: git.pot: v1.8.5 round 1 (68 new, 9 removed)).

Signed-off-by: Ralf Thielow <[email protected]>
Acked-by: Thomas Rast <[email protected]>

Author: ralfth