It is easy, one would imagine, for a filmmaker to be overwhelmed by the words of the great August Wilson. Especially if they’ve never made a film before. Musical and marauding, the Pulitzer Prize-winning playwright’s language is a vessel for the ambition and anger of his people. Netflix’s The Piano Lesson — the latest adaptation of Wilson’s celebrated Pittsburgh Cycle of plays — is directed by the debutante Malcolm Washington, whose father, the legendary Denzel Washington, has publicly devoted this stage of his career to shepherding Wilson’s work onto the screen.