[TASK] Remove unused language labels in ext:reports

This change removes several unused language labels in ext:reports.
Related functionality for affected labels has been removed in
TYPO3 6.2 or TYPO3 8.7 (`phpPeakMemory` check).

Resolves: #102733
Releases: main
Change-Id: Id8871f254860dac29ad1613f6c5dc7ff8df02a5f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82291


Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>