Merge pull request #1364 from mahagr/master

Minor fixes to #1250 (karma task url), fix win encoding in template helper file
Merge pull request #1368 from mahagr/master

Implement category filtering
#1372 K 3.0 Report to Moderator gives error (see inside)
Merge pull request #1373 from xillibit/k30_bugs1

#1372 K 3.0 Report to Moderator gives error (see inside)