Okay I was bored and googled for you.
It's Gaelic, although the band appears to be German from what I found. All this I've found google, I'm part Irish and Scottish but can't speak any Gaelic haha (Just like I can't speak any Italian either), it's a beautiful looking language though.
Unfortunately, after some searching, I can't find any translation, there's no official one according to the band, so hopefully Fenrir can translate it. There is apparently a German version though. Also found out it's a Gaelic folk song.
Heh, I'm not really any help. I'm going to watch some more That 70's Show now I think.
![Laughing :lol:](./images/smilies/laugh.gif)