- move 'Add list' button down to the group lists
- move member search box underneath members heading
- note about members being able to create lists is now under lists heading
- require confirmation before removing a member
- require confirmation before removing self
- make button text less verbose
- use more standardised formatting for group editing form
- improve button colours
- add missing trans tags
- reload group page when removing member
Let's do this the sensible way huh, by using backwards references to memberships etc
Also adds filters for is_member and is_invited so we don't have to do weird things in group Views