Is there a way to capture all the information sent when I click the translate button?
Check out the LiveHTTPHeaders extension for Firefox.
As to the error, I am guessing that the URL is not properly encoded, because "frenchWord" contains some characters that shouldn't occur in an URL. Try "java.net.URLEncoder.encode(frenchWord, "UTF-8")" instead.
Ping & DNS - updated with new look and Ping home screen widget