When I move or split a thread the message misses the link to the new topic.
Have a look in index.german.php at the two strings:
$txt['movetopic_auto_topic']
$txt['movetopic_default']
The second should have the "[TOPIC LINK]" translated the same as the first, so in your case probably it should look like:
$txt['movetopic_default'] = 'Eine oder mehr Beitrage in diesem Thema wurden verschoben nach [BOARD] - [THEMEN LINK]';
It is the same:
$txt['movetopic_auto_board'] = '[BOARD]';
$txt['movetopic_auto_topic'] = '[THEMEN LINK]';
$txt['movetopic_default'] = 'Dieses Thema wurde verschoben nach [BOARD] - [THEMEN LINK]';
I tried some combinations, but apparently works on my test forum...
I'm not sure what to look at.