I think my last dream went something like..."Cthulhu ftagn fluh glibamesh lilligish methalhen!"
Nah, just kidding, I dream in English, and only English.
Besides, when he visits my dreams, he doesn't say anything. He just stares, staring with vast uncaring eyes upon a pathetic species doomed to suffer it's end as his hundreds of tentacles writhe in anticipation of his surely soon to start feast, hehe, hahaha, AHAAAAHAAAHAAA!!!