[BUGFIX] Use editors language in admin panel instead of site language

The translations need to use the language of the current backend user
and not the one of the current language of the site in the frontend.

Resolves: #96004
Releases: master, 11.5, 10.4
Change-Id: Id409e759de4f0324835cc932f87719147b6e1b0f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72361


Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>