I don't know if my source is credible, but I looked on Deezer and I found this. It's not capitalised.
Even on the place where you can buy the CD, it's written without a capitalised S.
I found the cover of the disk where the song is from, but the problem is that on the disk cover, everything is uppercased. Here is a picture of it.
But as Kurai said, the video published by the label on YouTube is named with a capitalised S, and since it's a reliable source, it might be the right one to chose, since the picture of the CD shows everything with uppercased letters.
Don't know if it will help, but I guess we can find an agreement with it.
Even on the place where you can buy the CD, it's written without a capitalised S.
I found the cover of the disk where the song is from, but the problem is that on the disk cover, everything is uppercased. Here is a picture of it.
But as Kurai said, the video published by the label on YouTube is named with a capitalised S, and since it's a reliable source, it might be the right one to chose, since the picture of the CD shows everything with uppercased letters.
Don't know if it will help, but I guess we can find an agreement with it.