I found this a little hard to follow. Maybe state what the prerequisite is first:
When you test, make sure that your browser preference is set to the language you want to test. When you are logged in to the LMS, you can use the language preference widget on the student dashboard page to set your language. However, when you viewing Studio or if you are not yet logged in to the LMS, the site uses your browser preference to determine what language to display. See `this page on changing your browser's language   <http://www.wikihow.com/Change-Your-Browser's-Language>`_ if you need help.