Merge pull request #1 from thorin/master

Fixes a problem on issue list with both question columns and filters
Disabled gravatar of the inquired user: bronken since we don't have access to the request on the hook
Czech translation
Added missing czech translation

Also ungermanize answer subject :)
Limit autocomplete users only to members of a given project
Merge branch 'master' of https://github.com/igloonet/question_plugin