[BUGFIX] Add label for the description of scheduler group record

Add the description also to the xlf file.

Resolves: #62839
Releases: master, 6.2
Change-Id: I238616eb0e8d8720dba193469a754f87672d2a82
Reviewed-on: http://review.typo3.org/33965
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>