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Kindle for iOS has good dictionary support, and you can purchase third party dictionaries to supplement Amazon's. It also has a Translate feature: you can select text and have it translated to any of 15 other languages (uses Bing Translator, so you have to be online). It will also use Text To Speech to read out the translated text. No Vocabulary builder, but you can copy text and paste that to the note taking app of your choice. Amazon recently added Word Wise to the Android app, and I expect that may show up on iOS before long. This offers definitions of 'difficult' words in between the lines of text.
I think Translate is in general more useful than a translation dictionary, since you can translate entire sentences and not just single words, even where the quality of the translation is inferior.
The Kindle app uses the same dictionaries for English as iBooks, it seems (New Oxford American Dictionary, Oxford Dictionary of English).
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