Nailed it

 

I actually guessed that it was Khoekhoegowab. But no, I didn´t "know" it. I guessed it like this: If the language is spoken in South Africa, isn´t Bantu and has click sounds, it can only be a Khoisan language. The content-creator probably wants us to say "Bushman" or "San", since the Bushmen are well-known. Therefore, it´s a trick question and he must mean the language of the people formerly known as the Hottentot. And guess what...

Elementary, my dear Dr Watson!