I am trilingual, fluent bed for twenty years books in three languages. I suggest you include in the description of a book translated, the original title, regardless of the original language.
I live in border regions (Strasbourg) and the time of German books were only available on Amazon.de or Germany is thankfully over.
There was a time, I had already made the suggestion you to attach Amazon.com or Amazon.de customer reviews on Amazon.com. You did, thank you, although this is not very ergonomic (the stars are visible only by going to the detail of the book, they should be at the same level as the other reviews).
The change I am suggesting here is feasible, we must add a field in your database, and in the GUI (being a software engineer, I know what I mean).
Dear Amazon, the world changes, your customers and their expectations too. It would be good to evolve too.
Exercise: what is the English title of this book: Author = Archie Fire Lame Deer, Title = The sacred circle, Memoirs of a medicine man ???
Question: will it done with other means (mail address) to get this kind of suggestions?