[TASK] Reduce code complexity with language labels in PageRenderer

PageRenderer has some speciality but also code duplication
from LanguageService and can be simplified this way,
avoid additional parsing states.

This way, LanguageService can be used more instead
of handling language dependencies manually as before.

Resolves: #99540
Releases: main
Change-Id: I4416b349351ee629012bee8ad518c20b9efd7ed4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77378


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>