make "no answer" initial choice in questionnaires
added collapsibles for all contributors in a course's questionnaire
fixed test
refactoring
added buttons to skip contributors during feedback, removed the initial answer
language updates
refactor javascript to automatically select 'no answer'
changed program flow to 'keep the indentation at bay'
Merge pull request #360 from janno42/group_person_questionnaires

Group person questionnaires