added test for updating staff to deputy on employers page
implemented logic for update of staff member to deputy
added promote button to employer detail page to promote a staff member to deputy
#162 started to improve promotion dialog UI
Merge remote-tracking branch 'origin/develop-js' into develop-js-mail
#162 made promote dialog for students index prettier
#169 adapted rest promote/demote dialogs
#162 translated all promotion/demotion stuff to german
fixed demote bug
Merge branch 'develop-ja-promote-staff-to-deputy' of https://github.com/tkowark/hpi-hiwi-portal into develop-ja-promote-staff-to-deputy
#240 added security checks, and improved test coverage
#307 added github comments
changed the grey to the desired grey #288
one more spacing
show prolong button for admin only when job is running
small UI fixes
pulls demote button to the right
smaller fixes
Merge branch 'develop-ak' of github.com:tkowark/hpi-hiwi-portal into develop-ak

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Merge remote-tracking branch 'origin/develop-ak' into develop