Where can I get bilingual dictionary for my application?

I'm wondering if there is a place where I can get a bilingual dictionary in open format for my program. So开发者_如何学Python far I'd like to have just few language pairs: eng-esp, eng-frn, ger-esp, let's say. I googled and lurked without success so far.

I've done translation for an application using BabelFish and it came out ok, especially when you keep captions and messages short. To display different languages I used 'Chilkat's Charset' to render the different languages. I kept all the language translations in an excel file, good thing because customers have added to this language collection for us. The program has all the translations in text files that it uses to populate captions and messages prompts.

Would a google translate API work?: http://code.google.com/apis/language/