l10n: de.po: translate 65 new messages

Translate 65 new messages came from git.pot update in
64f23b0 (l10n: git.pot: v2.5.0 round 1 (65 new, 15 removed)).

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>

Author: ralfth