[TASK] Initialize TSFE language at an earlier stage

The languageService and pageRenderer instantiate their
language / locale information at a very late point, allowing
to only use TSFE's language features when TypoScript was loaded.

However, since TYPO3 v10, the SiteLanguage information is always
present in an earlier stage, so the initialization can happen earlier.

Resolves: #89575
Releases: master
Change-Id: Id9dc8268946041353430cb02e12631b048364acf
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62183


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>