GPII-738: Fixing problems in headings.

http://issues.gpii.net/browse/GPII-738
I see that you are using many `<h1>` tags through out. I think if you want do this, we should break up the preferences editor into sections using `<section>` instead of a `<div>` here. You can see more info on this page. http://html5doctor.com/the-section-element/