[TASK] Improve category listing in admin module

Change-Id: I622ad0abf0b8501425e19261b33006e29804ba4e
Resolves: #58876
Reviewed-on: http://review.typo3.org/31896
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>