l10n: de.po: correct translation of "completed" after resolving deltas

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
l10n: de.po: translate 45 new messages

Translate 45 new messages came from git.pot update in 5e078fc
(l10n: git.pot: v2.0.0 round 1 (45 new, 28 removed)).

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Acked-by: Thomas Rast <tr@thomasrast.ch>
l10n: de.po: improve hint for autocorrected command execution

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