Revert "removed not approved feature #139 from dev for merge with master"
Revert "removed not approved feature #139 from dev for merge with master"

This reverts commit e8fa66cad90a323be33c4c2275fa1a0784917ace.

hpi-swt2/event-und-raumplanung,chrisma/event-und-raumplanung,chrisma/event-und-raumplanung,chrisma/event-und-raumplanung,hpi-swt2/event-und-raumplanung