Sorry, a little late

things happened...
Anyway, I found this discussion from a few months ago:
https://www.mobileread.com/forums/sho...d.php?t=240305
Some prebuilt ones (spanish/bulgarian/hebrew/russian -to-english) here:
http://www.alonintheworld.com/2013/0...on-kindle.html
And more discussion here:
How to create mobi dictioaries using stardict
You can find plenty of StarDict dictionaries to convert, here:
http://abloz.com/huzheng/stardict-dic/