The fron-tend is not handling custom error responses

[luizhlelis]

The login endpoint from Authentication API could return http errors (4*) with custom messages in body. Take a look at the following response example:

{
    "name": "Error",
    "message": "Bla Bla",
    "fromSandbox": true
}

even so, the front-end is not handling that message and shows an empty red box: