I added most of the missing text lines/words for both voices (based on this music video). I also added all missing Spanish characters (saved in UTF-8 with BOM). My last edit some minutes ago should be online here in some hours.
But I did not check the tone pitch of the added text lines, because I'm not good at this. But I used the tone pitch from Luis Fonsi, which was already in this txt file. So it should be good enough to sing. But feel free to correct this.
