[!!!][TASK] Move last language files away from language extension

This commit moves any language file of EXT:lang into a proper
destination, which renders EXT:lang obsolete.
This change requires an update of typo3/testing-framework, done with this
command:

composer update typo3/testing-framework

Resolves: #84680
Releases: master
Change-Id: I7ba59c1a10015121ed444a9c98082bad0348e03d
Reviewed-on: https://review.typo3.org/56017


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Riny van Tiggelen <info@online-gamer.nl>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>