Advent song for December 21: Gospel song, Namibia

I need a linguist to help me out here, please. The official language of Namibia is English, but there are at least eleven other languages spoken across the nation, and although I’m reasonably sure it isn’t German or Afrikaans, I’m no closer than I was when I started an hour ago to finding out what language this is sung in.

It doesn’t matter all that much, though, because the reasons I chose this song are 1. It features a ginger Jesus and 2. the slightly tentative, not-quite-in-unison (but beautifully tuneful) singing reminds me very much of that bit at a Russian Orthodox church services where two priests have to sing something they only mostly know and half busk it.

(This observation will only mean anything to about six other people, sorry.)