function qtrans_disable(){
	global $typenow, $pagenow;

	if (in_array($typenow, array('teacher'))) {
		remove_action('add_meta_boxes', 'qtranxf_add_meta_box_LSB');
		remove_action('admin_head-nav-menus.php', 'qtranxf_add_nav_menu_metabox');
		remove_action('admin_head', 'qtranxf_admin_head');
		remove_filter('admin_footer', 'qtranxf_admin_footer', 999);
		remove_filter('the_editor', 'qtranxf_the_editor');
	}
}
add_action('current_screen', 'qtrans_disable');