[BUGFIX] Localisation update doesn't work

Change-Id: I3353dfa5425fab87186dfbb9174bc71ec0acee86
Fixes: #36027
Releases: 6.0, 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/10449
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Galinski
Tested-by: Stefan Galinski