private function add_to_po($string) {
		$this->strings[$string] = '';

		$current_strings = Util::load(Config::$po_directory . '/' . $this->language->name_short . '/' . $this->application_name . '.po');
		$untranslated = [$string => ''];
		$strings = array_merge($untranslated, $current_strings);
		ksort($strings);

		Util::save(Config::$po_directory . '/' . $this->language->name_short . '/' . $this->application_name . '.po', $this->application_name, $this->language, $strings);
	}