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.
Since this is a duet song, don't forget to add the P1 and P2 tags, because USDB don't support them.
