Trying to translate "achmed the dead terrorist"

[Ayzìsìt Alenantang]

If anyone knows Jeff Dunham's sketch, "Achmed the dead terrorist", I'm trying to translate it.
Tell me if I'm wrong:

Na'Vi:

Jeff: Sìltsana txon, Achmed.

Achmed: Sìltsana txon... skxawng.

Jeff: Nga txopuyä zamungeyu lu, srak?

Achmed: Srane... oe txopuyä zamungeyu lu.

Jeff: 'upe txopuyä zamungeyu nga lu?

Achmed: Txopuyä zamungeyu... a letxopu.

English:

Jeff: Good evening, Achmed.

Achmed: Good evening... infidel!

Jeff: So you're a terrorist, right?

Achmed: Yes... I am a terrorist.

Jeff: What kind of terrorist?

Achmed: A terrifying... terrorist.


Have I done it right?

[kewnya txamew'itan]

Good evening is a rather idiomatic greeting and doesn't translate literally very well.

The only Na'vi greetings that we know are Kaltxì and Oel ngati kame.

I'd probably go with the latter here as it lets you play with the inflections.

(I haven't seen Achmed so I don't know if this is correct) but I'm assuming Jeff is an interrogator in which case he is likely to be quite calm and would probably same Oel ngati kame whilst Achmed is obviously angry and might insert an <äng> infix making it Oel ngati kamänge.

I haven't had time to read the rest yet so I can't comment on that.

[Hawnuyu atìtse'a]

Fnu! Oe ngati tspayang!
Be quiet! I you-ACC will kill!
Silence! I kill you!

[kewnya txamew'itan]

But half the fun is the bad grammar in that quote, please drop the <ay>. 

[Ayzìsìt Alenantang]

That quoute is in my signature.
he says "i kill you" not "i'll kill you" so "Tìfun! Oel ngati tspang"

[kewnya txamew'itan]

where'd the tì- come from? Silence is an order not a noun so it's unnecessary isn't it?

[Roiki]

I don't think skxawng is a good translation of infidel since they have totally different meanings. Skxawng means idiot, infidel means "one without faith" ie a person who doesn't believe(the same way as the person saying). If you want to be more accurate the na'vi meaning should be "someone who does not See" though saying that is quite a long phrase.

[Ayzìsìt Alenantang]

Well, skxawng is legitimate, since "infidel" is just a way for him to insult Jeff, and his 'ìnglìsì is quite bad, so a long phrase just to express "infidel" will be frustraiting and will make it just not funny.