[BUGFIX] Language labels taken from wrong language file

The module "Pagetree overview" in Web > Info is showing an empty
selectbox because the language labels for this dropdown are called from
the wrong language file.

This patch changes the calls to the language labels

Change-Id: I791598933704752fd6d5ed0d987f43bde1811452
Resolves: #56762
Releases: 6.2
Reviewed-on: https://review.typo3.org/28255
Reviewed-by: Sebastian Müller
Tested-by: Sebastian Müller
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters