public function metaKeywords($keywords = null, $language = null, $escape = true) {
		if ($keywords === null) {
			$keywords = Configure::read('Config.keywords');
		}
		if (is_array($keywords)) {
			$keywords = implode(', ', $keywords);
		}
		if ($escape) {
			$keywords = h($keywords);
		}
		$options = [];
		if (!empty($language)) {
			$options['lang'] = mb_strtolower($language);
		} elseif ($language !== false) {
			$options['lang'] = Configure::read('Config.locale');
		}
		return $this->Html->meta('keywords', $keywords, $options);
	}