Revise localized agreements

This is a very rough draft of revising the way we're localizing the agreements after the discussion following https://github.com/mozilla/fxoss/issues/199#issuecomment-51694614. Will utilize the "Ready for Review" label when appropriate.
Maybe grouping all of them into a class-based view? Then it becomes more obvious which view is using the helpers.

(Don't do this for this PR it'd be a waste of time, I'm just noodling out loud)