Update extension to change language with a dropdown menu

I updated the extension to change the language through a dropdown menu, instead of having to go to the chrome://extensions page. I also stubbed out a BASIC Ajax method to do ajax calls. If we need to have a more robust Ajax library, we can add one or use a third-party. Did not think it was necessary since we are just doing "GET" requests. Currently, the extension is using a static language Array, but we should discuss a way to pull in the language types dynamically either through a database, JSON file or filesystem.