A tablet that uses a translation dictionary

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http://androidforums.com – I am an English speaker who is trying to improve my Spanish comprehension, so I want to be able to download spanish language books to my ereader, and when I come across a word I don't know, I'd like to be able to touch it, and have the translation appear. I think if I were able to change the default dictionary on the device to a Spanish English dictionary this would work, but you can't change the default dictionary with a kindle fire (for example) and I wonder if you can do that with a Pandigital Supernova, or perhaps the new google Nexus 7? Does anyone know, or perhaps have one of these de (General)