l10n: de.po: translate 72 new messages

Translate 72 new messages came from git.pot update in 18a9072 (l10n:
git.pot: v2.16.0 round 1 (64 new, 25 removed)) and 005c62f (l10n:
git.pot: v2.16.0 round 2 (8 new, 4 removed)).

Signed-off-by: Ralf Thielow <[email protected]>
Acked-by: Matthias Rüster <[email protected]>

Author: ralfth