On the linked Russian forum, user Hinkes says:
"Writers from CDP wasted half a day to find what exactly it was. And found:
Oh, carrot, tasty carrot,
With even fat/lard on top,
And also chicken with parsley..."
The post is met with a resounding "HUH??!!"
To which Hinkes responds:
"No joke. We and the localization department from CDP tried to translate this on our own and failed. We then asked the writers, and they replied that they didn't remember, but got curious themselves. Then they spent half a day pulling up old archives with scene descriptions, and found it. By the way, the original scene description says that there is a bowl of soup on the table in front of Iorveth.
And judging by the tone of his voice, he's smoking something other than regular tobacco.
Kinda sad, really. No elven poetry whatsoever."
So this confirms my theory that Iorveth, the scourge of d'hoine, dreams of peacefully smoking weed and reciting an ode to chicken soup.