[core] Deleting admin user message yes button keeps circling

OS:Browser info: Windows 7: IE 11/Chrome 58.0.3029.110 (64-bit)

Steps to reproduce:

1. On the top right corner, click "your user name" --> "Manage Users"
2. select your own login user from user list, and click "Delete"

Expected behaviour: A Message "you cannot remove yourself"

Actual behaviour: I get the loading button circling with a 401 error. i do see the response data with the actual message

Request URL:http://<hostname>/useradmin/users/delete
Request Method:POST
Status Code:401 OK

Response data:
{
"message": "You cannot remove yourself.", 
"traceback": [], 
"detail": null, 
"is_embeddable": false, 
"title": "Error"
}

Attached the screen shot