Honestly, any currently available ereader will do what you ask. The dedicated ereaders, such as Kobo's and Kindles, all can get books from their associated store, and all can have books sideloaded to them. You just need to be able to convert them to an appropriate format, which is easy. Whether DRM is an issue will depend on the store and the book.
For dictionaries, they all do lookups by selecting a word and either the lookup is done automatically, or you select a menu item (Kobo does it automatically, I think Kindles do as well, don't know about other devices). They should use the language set for the book. For Kobo devices, you can select another dictionary once you have looked up a word in a book. I assume the others do the same, but, I haven't used them. The real difference is going to be the number of available dictionaries.
Alternatively, you can use a tablet. They will support different ereader apps. They probably work in a similar way, but, I don't use them, so I am not sure.
I don't think differentiating on the dictionary or what can be put on the ereaders is useful. As I said, the answer is pretty much, "all of them". There are other things, such as screen type, size, storage, availability, button, price and whether you want to use it for other purposes, that are more important at this point.
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