In the movie, David takes Weyland to the only surviving Engineer in hopes that the Engineer can keep Weyland alive forever. But the giant being responds violently after David says something to him. Some believe that David told him to kill Weyland, while others say that David just translated Weyland's words.
To get the answer, The Bioscopist reached out to the linguistics consultant Dr. Anil Biltoo, who revealed that there was an actual conversation between David and the Engineer, but the scene was shortened for time purposes. He went on to say that the line that David delivered is translated to: "This man is here because he does not want to die. He believes you can give him more life."
In other words, he said what Weyland wanted him to say. Hopefully we'll get the subtitles for the full conversation on DVD/Blu-ray
Source: http://thebioscopist.com/2012/06/20/the ... -engineer/
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