[BUGFIX] Language labels missing in Localization Overview

The submodule "Localization Overview" of Web > Info is missing
language labels. These labels are requested from the wrong localization file.

This patch fixes this by changing the label calls to a different file.

Change-Id: Id6aaddf3e9bb88da30bb5008b875279b0b07daa5
Resolves: #56767
Releases: 6.2
Reviewed-on: https://review.typo3.org/28260
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind