added deactivate function
more changes
added dependencies
fixed typo
fixed dependencies
merged develop
fixed typos
fixed tests
fixed merging mistake
solved some remarks
merged develop
added test
solved issue due to merging
added student remove button
don't forget the master's degrees ;)
solved #442
refacored redirect messages
Merge pull request #449 from hpi-swt2/feature/deactivate

Feature/deactivate