Make sure that the currently-set language is the one that shows on the left sidebar if no language  preference exists.

Some students were confused by the display on the sidebar when it would say 'English' even if the text was in another language. This should fix the problem.

@flowerhack @sarina @stephensanchez 

ECOM-135
I think the assumption is that we can't set the user preference until it's released. I'm not sure what the correct behavior should be when we un-release a language.