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.
...to the period on this line can go away and make this paragraph much more understandable. If you still feel the need to highlight that putting up an English version before having translations, I think it'd be best done elsewhere.