[!!!][TASK] Remove unused language labels from EXT:sys_action

The labels that are not used anymore in the core are removed.

Resolves: #78855
Releases: master
Change-Id: I8b7ac0ee8670f7abbf57f275e20c8c4fbbf36436
Reviewed-on: https://review.typo3.org/50466


Reviewed-by: Alexander Stehlik <alexander.stehlik@gmail.com>
Tested-by: Alexander Stehlik <alexander.stehlik@gmail.com>
Reviewed-by: Valentin Funk <valentin.funk@computerfabrik.de>
Tested-by: Valentin Funk <valentin.funk@computerfabrik.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>