(WIP) Studio: Adds Language Selection Menu

This works adds a language selection menu to a user's dashboard (per UI/feature request found here - https://edx-wiki.atlassian.net/wiki/pages/viewpage.action?pageId=48726317).

Status: The static assets and styles have been added, but JavaScript to manage the status/editing states as well as submit the form and save the user setting are still needed.
Totes! This set of fields was just for proofing the rendering and to help suggest how I was expecting the options to be marked up with HTML.