l10n: de.po: translate 35 new messages

Translate 35 new messages came from git.pot update
in 9caaf23 (l10n: Update git.pot (35 new, 14 removed
messages)).

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

Author: ralfth