game: implement human-readable extension names

game.go

@@ -205,6 +205,17 @@ func tokensByExtension(ext string) map[Token]int {
 	}
 }
 
+func extensionToString(ext string) string {
+	switch ext {
+	case "base":
+		return "Base game"
+	case "ext1":
+		return "Inns and Cathedrals"
+	default:
+		panic(fmt.Sprintf("unknown extension <%s>", ext))
+	}
+}
+
 // example menu layout
 // ____________________
 // Turn: since