[BUGFIX] Add missing file extensions of language files

In some places the file extensions of language files are missing and
properly added with this patch.

Resolves: #95842
Releases: master
Change-Id: Iea638f9386a094214115d2c7c2c039b2c0f37f82
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72018


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>