public function flash_message_support() {
		$cookie        = $_COOKIE;
		$flash_message = dozent_array_get( 'dozent_flash.message', $cookie );

		if ( ! empty( $flash_message ) ) {

			if ( is_admin() ) {
				add_action( 'admin_notices', [ $this, 'admin_show_flash_message' ] );
			}

			setcookie( 'dozent_flash[message]' );
			setcookie( 'dozent_flash[type]' );
			setcookie( 'dozent_flash[view_count]' );
		}
	}