[BUGFIX] TCEforms: Localization value boxes are too wide

Change-Id: I66e57ae0459f76f79c9f9ae19bdb2a14820adc74
Releases: 4.6, 4.5
Resolves: #28030
Reviewed-on: http://review.typo3.org/3198
Reviewed-by: Stefan Neufeind
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers