Translation switched to another release
I'm told that the translation was switched to another of the MantisBT branches. I don't know what messages changed in the original and what happened to translations; some translations might have been synchronised incorrectly.
Since no developer seems to be editing language files, it should be safe to reinstate whatever translation you consider more correct, in order to have it exported to the actual software.
> I'm told that the translation was switched to another of the MantisBT branches
For the record, this occured when MantisBT 1.3.0 went live and we created a new master-1.3.x branch to support the new stable release, while the master branch moved on with new development towards 2.0 release. TranslateWiki was previously configured to update master, but we did not inform you of the change in a timely fashion.
All translation updates should go to the master-1.3.x branch. The MantisBT dev team does not commit anything to language files, other than the original strings_english.txt.