[BUGFIX] Add missing identifier to newly introduced xliff file

Resolves: #61542
Releases: master
Change-Id: I18f3d43b3f7c868f68d935676d3896632dafc1e6
Reviewed-on: http://review.typo3.org/35022
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>