Amazon.de just introduced a new translated UI for english. Click the globe icon on the menu bar, next to "My Account" and select english. Haven't tried it myself, so I can't comment on the quality of the translation.
It's good enough that I occasionally slip up and forget whether I'm on the US or DE site, since I check prices at both for used books and use the US site when buying stuff for people back home - sometimes, the only difference in the sites is the currency of the prices.
