On many pages we may (or must?) add a (translated) statement of this kind: "Only the original English version of this document/page is deemed authentic. Translations are provided for information only." (I don't know how one would say that in a really smart English ;).
I may create a set of templates, for the main languages (de, ja, fr, zh, it, nl...) and add it to the pages where such a disclaimer would be useful/needed (say, translations of the Privacy policy, the Bylaws, the visual identity guidelines...)