So here's a thing. One of the earlier posts remarked that this song is still under copy right. Not according to my research. By Canadian copyright laws, the copyright expires 50 years after the death of the author. He died in 1937, if I remember correctly, which means that the copyrights expired the year before this thread was posted. To do the chorus in English
Sleep 'ti the day laddie La Laddie Sleep the moon away.