Confirmation dialog is not shown while removing a Member from a Group

[OleksandrOrlov]

There is no confirmation dialog while clicking on "X" button to remove a Member from a Group. All destructive actions should require confirmation to prevent user errors.

Steps to reproduce:

1. Log in as Admin;
2. Create new group if there is no one yet (Configuration->Manage Groups->Create Group);
3. Go to Group Members Page for the recently created group (e.g. by clicking on its title in the list);
4. Press "+" button to add new member;
5. Click "x" icon on the Member's tile to remove the Member.

Expected result:
Confirmation Dialog is shown.
Actual result:
User is removed without any confirmations.

The comments deletion and status message deletion should be the closest ones in terms of implementation.