Etienne Van Heerdon is one of South Africa’s leading Afrikaans writers. He tells Steve Paulson that many of his fellow writers are obsessed with his country’s history and that they could always say things in fiction that they could never get away with in journalism. And he reminds Steve that there have always been Black speakers of Afrikaans and he was not wiling to cede his language to the racists. Van Heerdon’s latest novel is “The Long Silence of Mario Salviati.”