public static function get_difficulties() {
		return apply_filters(
			'llms_install_create_difficulties',
			array(
				_x( 'Beginner', 'course difficulty name', 'lifterlms' ),
				_x( 'Intermediate', 'course difficulty name', 'lifterlms' ),
				_x( 'Advanced', 'course difficulty name', 'lifterlms' ),
			)
		);
	}