Add dataTables to semester results overview tables with sorting and filtering
Put arrows to the left of the header texts
Sort responsible contributors by last name
Prevent text wrapping in table head, decrease size of type column
Add extra class to the tables in order to only select these for conversion
Update German translation of 'Search:' string
Merge pull request #362 from PFischbeck/course-result-sorting

Table sorting and filtering for semester result overview