Media module login form has poor usability and bugs

Steps to reproduce:
1. Publish a video without allowing anonymous read access
2. Go to the media module
3. Attempt to log in

Actual Results:
-With incorrect credentials there is no warning that they are incorrect, and the login prompt closes. The user is not logged in, so nothing changes
-With correct credentials things work as expected

Other issues:
-Username is not focussed, requiring manual click before user input
-Hitting enter does not submit the form