public function setString($context, $text, $plural = '')
    {
        $this->context = (string) $context;
        $this->text = (string) $text;
        $this->plural = (string) $plural;
        $this->hash = md5($this->plural ? $this->context . "\004" . $this->text . "\005" . $this->plural : $this->context . "\004" . $this->text);
    }