Actually I think I won't buy the dictionary on amazon.com because I already have one of 58.000 entries ( I wrote it on my first message ) made free of charge by the french people of the forum and the dictionary of amazon seems to have almost the same number of entries so perhaps it won't change a lot, apart if someone has made a comparison ?
And Phili, well thanks a lot for this link, it is very interesting because I was also searching a german translation dictionary and if I don't find one French<->German (what is unfortunately almost sure

) I will take that one !
Otherwise the french one here proposed has got "just" 6 thousands entries,which is far less than what I have with the one I downloaded on the french part of the forum.