Sadly, I only speak English :( but learning to swear in another language interests me, not only it means I can yell at you in your own language, but, if I do try and say something, avoiding the offensive words are easier if I know what they are!
Bouffe ma queue calisse de fag - Eat my cock you fucking faggot
Brûlez dans l'enfer - Burn in hell
As a French from France, I have to add that a good part of these are actually Quebec French expressions and are not used at all in France.
This is just informal, some of them are awesome :P
As a native Québécois, I have to say that some of these insults are quite creative! But sadly, it seems that the one who compiled them is not a francophone... Some gender agreements are horrid. But well, nice to him! He has a good imagination!
"Fick dich du arschgefickter Hurensohn!" - "Fuck you you assfucked son of a bitch!"
4 fingers up, then pointer and thumb in a circle - F
2 fingers up, together - U
Jende = Bitch
Kiri = Nasty Dick sucker
Kuni = Faggot
Nane Jende = Son of a bitch