Added Korean (ko_KR) translation. Thanks ardiefox.

FossilOrigin-Name: 7fa0e987609c9ccb3d1518f21230e26f8a122d5c

src/MainWindow.cpp

@@ -2092,6 +2092,7 @@ void MainWindow::on_actionAbout_triggered()
 							"Zangune: it_IT\n"
 							"Fly Man: nl_NL\n"
 							"Rick Van Lieshout: nl_NL\n"
+							"ardiefox: ko_KR\n"
 					   );
 }