[BUGFIX] Add missing labels for Extension Manager

The Extension Manager is missing the labels when opening
the About Modules in the backend.

Change-Id: I4ea3a312e707dd1af22f6a693298170c32e19ecc
Fixes: #44941
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/17812
Reviewed-by: Jan-Erik Revsbech
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Mattias Nilsson
Tested-by: Mattias Nilsson
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn