Fix the broken SQL query and remove disallowed system languages for
restricted backend users.

Resolves: #71433
Releases: master
Change-Id: Icff5b13dfd9f17fd6b570ce8bd370e15522f7bac
Reviewed-on: https://review.typo3.org/44627


Reviewed-by: Andreas Allacher <andreas.allacher@gmx.at>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Andreas Allacher <andreas.allacher@gmx.at>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>