Wiktionary contributor Matthias Buchmeier has created
bilingual dictionaries from Wiktionary data for a couple of languages.
He also links to a couple of projects that will generate word lists from Wiktionary files, for example
wikt2dict.
However, you'll need to either reformat these text files to the
dictionary format required by KindleGen or tab-delimited files and covert them with
tab2opf.py or
tab2opf.exe.
(The
dictionaries generated by the wik2dict project are perfect for tab2opf, but many of them don't contain enough entries to be useful)
Out of curiosity, what language combination(s) are you interested in?