[BUGFIX] Subgroups field in usergroup edit form should be renamed

Change misleading translation in backend group edit.

Resolves: #24303
Releases: master
Change-Id: I7b7a8b597f94c75948bae21ab153eb103627a215
Reviewed-on: http://review.typo3.org/36396


Reviewed-by: Zbigniew Jacko <z.jacko@macopedia.pl>
Tested-by: Zbigniew Jacko <z.jacko@macopedia.pl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Steffen Müller <typo3@t3node.com>
Tested-by: Steffen Müller <typo3@t3node.com>