Whilst trying to create an event:
The icons used for the participants are not immidiately understandable. Why would you need different colours for "Vorstitz" or "Erforderlich"? Why are these options even available?
Steps to reproduce:
1. Create an event on any day
2. Go to the Category "Participants"
3. Go to "Find Availablitiy"
4. Icons are shown, with their meaning
Expected result: Intuitively understandable icons and meanings
Actual result: Not understanding them