BibEditMulti: fix for multilanguage interface
- Fixes the errors in the BibEditMulti interface for language versions different than English. (fixes #1331)
- Removes the hardcoded English words in the interface and replaces them with the translated ones.
Reported-by: Stefan Hesselbach <s.hesselbach@gsi.de>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>