Initial draft with UI changes

@gwprice and @mhoeber , this still needs changes to policy key settings/new images for the Studio changes that will be in tomorrow's release. Also, most of the paragraphs are not wrapped onto new lines, but I didn't want to distract from where I actually made changes. I'll do that later.
I think it's fine given the other terminology. Personally, I prefer "post" as the all-encompassing term and "thread" or maybe "conversation" for threads.