The translation is a bit loose in the first film, but gets more faithfull in the next two.
And here it's a classic: "Met la gomme Chico !"*
It's even sampled by the french rap scene**...
Haha! I forgot that one!
I was kidding when I said "La honte". Personally I'm a purist who needs to watch films in V.O. but other people have different tates...DUH!
You're right though, the first film is really loose. Not only that, but "Dark Vader" sounds like he's speaking through a cardboard tube!