Discord: implement popup if login/password are incorrect

[dartraiden]

{"code": 50035, "errors": {"email": {"_errors": [{"code": "INVALID_LOGIN", "message": "Login or password is invalid."}]}, "password": {"_errors": [{"code": "INVALID_LOGIN", "message": "Login or password is invalid."}]}}, "message": "Invalid Form Body"}

we should add smth like