[BUGFIX] Fix language module naming in ext:setup

Furthermore the text constants are moved to the locallang file.

Resolves: #92212
Releases: master, 10.4
Change-Id: I9fd33ce977879f5f2a4b515850a214d249b8d028
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65615


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Benni Mack <benni@typo3.org>