Inpsyde\MultilingualPress\Installation\SystemChecker::check_multisite PHP Method

    private function check_multisite()
    {
        if (is_multisite()) {
            return;
        }
        /* translators: %s: link to installation instructions */
        $message = __('This plugin needs to run in a multisite. Please <a href="%s">convert this WordPress installation to multisite</a>.', 'multilingual-press');
        $this->errors[] = sprintf($message, 'http://make.multilingualpress.org/2014/02/how-to-install-multi-site/');
    }