Here are some notes I made earlier on as I was listening to the track.

"A high and haunting female voice leads off the track and continues to provide backup vocalizations throughout (no actual words).
Belafonte takes over with wailing sounds before leading into a French patois lyric along with English translations for the chorus only."

Sadly, all of this leaves us with an incomplete reading of the lyric(s).

I will stay tuned and report back if I uncover any leads or tidbits.