**Steps to reproduce**
add contact to group
delete contact from addressbook
**Actual results**
If one deletes a contact from any group, it is automatically deletet from all groups and the adress book
**Expected results**
Deleting a contact from a group is probably interpreteted as removing him from this specific group without an influence on any other groups. By pressing the delete button the user should hence receive a warning, that his action will lead to deleting the contact from of all groups and his address book.