[BUGFIX] Fix Unicode conversion

Change-Id: I312f05ef12669030456be749206c4bd9075dbc38
Releases: 2.1
Resolves: #62202
Reviewed-on: http://review.typo3.org/33298
Reviewed-by: Fabien Udriot <fabien.udriot@ecodev.ch>
Tested-by: Fabien Udriot <fabien.udriot@ecodev.ch>