function get_columns() {
		$columns = array(
			//'cb'                => '<input type="checkbox" />', //Render a checkbox instead of text
			'display_name' => __( 'Name', 'dozent' ),
			'user_email'   => __( 'E-Mail', 'dozent' ),
			'total_course' => __( 'Total Course', 'dozent' ),
			'status'       => __( 'Status', 'dozent' ),
		);

		return $columns;
	}