Instead of juggling with the globals, this should be handled within
the same LanguageService instance that knows the language
that was fetched.

Instead LanguageService now always returns the loaded
labels from the given file.

Resolves: #88567
Releases: master
Change-Id: Ie6a0367712625358b2c95b556c9fb0590e0d52ab
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60878


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>