The configuration of an extension can make use of
labels and those are not translated in a select box.

Therefore use LANG->sL()

Change-Id: I12c09b3cf0b68e5f5f0f1d03ac5f78dd89d7bbde
Fixes: #42931
Releases: 6.0
Reviewed-on: http://review.typo3.org/16437
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert