Replace Google translation by a dictionnary website in an add-on

I use the famous Anki freeware. A freelancer-made add-on takes words in a text file, add words in a deck and insert their translation taken in Google translation. For German to English translations, I want instead the following website to be used: http://dict.leo.org/ende/index_de.html#/search=&searchLoc=0&resultOrder=basic&multiwordShowSingle=on