The paperwhite has a translation function so if, for instance, you come across a French phrase or something, you can see what it means if you're not sure. I don't know if it needs the dictionaries or not. I'd guess not since they're not actually ON the kindle, once you've chosen your default language. . . .but I don't know for sure.
I'm pretty sure it doesn't use them for the translation; they're for if you pick the primary language to be something other than English. You can delete them from your account. Or not. They'll arrive again if you buy a new Kindle.
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