[BUGFIX] Change description for Scheduler labels

Change-Id: I3fde8d84171498df77f6226411f79022dc2de0a7
Reviewed-on: http://review.typo3.org/32213
Reviewed-by: Thierry Brodard <thierry.brodard@techniconcept.ch>
Tested-by: Thierry Brodard <thierry.brodard@techniconcept.ch>