Added comments to ProjectCreateForm.dart to explain the dynamic addition of target language sections to the page. Part of #876
Added more doc comments to ClaimedTasksStream.dart and added doc comments to TaskStream.dart. Part of #876
Fixed 3 issues on claimed tasks stream; removed unneeded divs with unused CSS class, instead of using inline style on whole filter container to make filter titles bold created a new CSS class that is applied to each title. Ordering options for order by created time were mixed up; newest first was actually showing oldest first and vice versa.