[TASK] Finish moving locallang files

Move the remaining locallang files to
Resources/Private/Language.

Releases: 0.6
Resolves: #54539
Change-Id: Ide172fd2891649581d36cfa640762b976295348e
Reviewed-on: https://review.typo3.org/26521
Reviewed-by: Francois Suter
Tested-by: Francois Suter