(Oct 2014:) Google translate does not allow an iframe to be translated. They are happy to translate the complete window, though, and then the URL for your specific case could be something like:
http://www.google.com/translate?hl=fr&ie=UTF8&sl=en&tl=fr&u=http%3A%2F%2Fjulienlussiez.bandcamp.com%2Falbum%2Ffragile
sl means source language, so sl=en is a declaration that you believe the source is in English.
tl means target language, so tl=fr means that you request a French translation.
I believe that hl means human interface language, i.e. with that parameter you request and comments, buttons etc from google to be in a specific language. (French in this case).