Don't use quotes -- " " -- or backslashes -- \ -- just type in your cheatcodes separated by a space!

knoppix fromhd=/dev/hda2 lang=be keyboard=be

AFAIK, you're going to have to save your persistent home to another partition than the one you're loading the Knoppix image from. Even though I'm having an argument over whether you can use "fromhd" and then mount the partition the image is on in read-write mode (in this thread), I don't think you can load the image and a persistent home from the same partition.