[feature] Delete in groups red / Warning before deleting

[cpy82]

Version and OS
0.50.39 on docker

Is your feature request related to a problem? Please describe.
I accidentally deleted an entire group.

Describe the solution you'd like
It would be nice if you could also color the "Delete" (maybe also "Unlink"?) button within the groups red.
Maybe it would be sensible for all deletion actions to first display a message like "Do you really want to delete?"

Thanks!

[dgtlmoon]

also related #3382