[DEV-1732] Add disclaimer to Askbot pages.

The disclaimer ended up being added to more than just the main, help, and FAQ pages.  Because of the way Askbot's templates are structured, it was easiest to add it to any page that inherits from the two_column_body template, which includes the above three plus the ask & edit question dialogues and badge pages.
There was a closing div at the bottom of this block, but no corresponding opening div.