Most of Amazon’s regional websites offer machine-translation (although the language selection varies by region). Click the Flag next to the search field on the front page.
I really don't understand why e-commerce services do this, especially when the UI behind the scenes supports i18n and has translations. Amazon do have country specific listings, so maybe they just don't want to show two languages, but that is often what happens on Amazon DE if you choose English. If you choose to ship to a different country they will change prices to account for different taxes, so it's not that.
Other e-commerce services are even worse, e.g. Zalando has a single app for all their countries, and the listings are the same, but they don't let you choose the language at all. Just because I am living in a country, doesn't mean I speak the language of that country.
[0] Which is another weird thing, as most of the time they do ship here. I'm somewhat surprised they have't merged to a single "Amazon Europe" storefront, instead they are still opening new country specific storefronts.