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
So - this changes the display but does *not* set the user's language preference, right?