Improve emojis for collectives
When creating a new collective, a default emoji should be picked randomly from a subset. We have to define a subset of emojis that are not offensive or vexing to anybody.
Also, right now, the option to give collectives an emoji is hard to spot. Users often miss the option when creating a collective. And they don't know that it's possible to set one later by clicking the star in front of the collective name either. Move it to a settings modal instead (see #258 (closed)).
Clicking on the emoji in collectives list should open the collective, not the emoji picker.
Related to #258 (closed)
Edited by Jonas