It's not in the normal song, she just added it on to the end. She thinks she's a dragon or something.
I know the person in the video sang it. The original post you replied to was
nice one did she sing it (the song she just sang, "The Dragonborn comes") in dragon language in the end?
and you replied that yes, she did, and provided the lyrics in the dragon language. I was saying that no, she didn't, as those were indeed NOT the lyrics to "The Dragonborn Comes".
EDIT: Sorry, when I said "you" I meant the person with which I began the conversation, didn't pay attention to the change in username there.