Rename cookie_message section to footer_cookie_message.
Update the selector for the button element in the cookie message section.
Update vcr ignore logic.

Only ignore Poltergeist's PhantomJS startup polling.
Instantiate the site prism page base class as current_page.
Translate the cookie message 'Close' text.

Also refactor the translation structure a little.
Finish cookie disclosure features.

Various refactoring performed based on discussions.