It turns out that what you'll currently find on the web -- via wiki answers, imdb, etc. -- is based on the shooting script, not on what is actually said in the movie. My good Hungarian friend Martón Dornbach tells me that the following is what Arkosh Kovash really says. (He also tells me that the name Ákos Kovács -- spelled that way -- is actually quite common: something like the Hungarian equivalent of "John Smith.")

Arkosh Kovash: … that I live. You… you fool, don’t you understand what I’m saying? If you don’t understand… he kills everyone. I know that man… I know what he looks like.  Can’t you understand me?  But you can see I don’t speak English!  Listen to me!  I saw his face!  If you don’t bring someone right away they will kill me.  I saw Keyser Söze! [Láttam a Keyser Söze-t!] Don’t you understand?! [Te nem értesz?!] Keyser Söze!!

Arkosh Kovash: They will kill me [meg engemet], don’t you understand?  I saw the devil! [Én láttam az ördögöt!] I saw him [láttam]... saw him face-to-face [szemtöl-szembe láttam]... I will be killed [meg fognak gyilkolni]... I saw the devil [én láttam az ördögöt]... saw him face-to-face [szemtöl-szembe láttam öt].

Translator: Who is this devil? [Ki ö ez ördög?]  Who did you see?

Arkosh Kovash: Keyser Söze.  I saw him.  It was him at the harbor.  He was the one who killed everyone. ... I saw his face... I am seeing it when I close my eyes now.