add responsible indicator

[felixrindt]

when testing the bulk actions, it was helpful to have some kind of indicator in the event list list to see what events I am responsible for.
This is what I came up with in a few minutes of tinkering with it.

closes #1258
closes #874

[coveralls]

coverage: 83.874% (-0.006%) from 83.88%
when pulling c01ad62 on responsible-indicator
into 92009e8 on main.

[jeriox]

cool idea. first thoughts:

• I'm not sure if the icon placement is perfect, this makes the title wrap even quicker
• not sure if the crown is the best icon choice/super intuitive
• we should also think about this in combination with Display event visibility #874, maybe we can even come up with some kind of combined indicator?

[felixrindt]

I got the query working :)