l10n: de.po: translate 108 new messages

Translate 108 new messages came from git.pot update in 9b7388a (l10n:
git.pot: v2.18.0 round 1 (108 new, 14 removed)).

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

Author: ralfth