class translateException extends baseException{
    /**
     * @var mixed
     */
    protected $translateVars = null;

    /**
     * @param string $message
     * @param mixed $variables
     * @param Exception $previous
     */
    public function  __construct($message = '', $variables = null, Exception $previous = null) {
        parent::__construct($message, 0, $previous);
        $this->translateVars = $variables;
    }

    /**
     * @return string
     */
    public function getTranslateMessage(){
        $st = translate::getTranslateString($this->getMessage());
        if(empty($this->translateVars)){
            return $st;
        }
        if(!is_array($this->translateVars)){
            $vars = array($st, $this->translateVars);
        } else{
            $vars = $this->translateVars;
            array_unshift($vars, $st);
        }
        return call_user_func_array('sprintf', $vars);
    }
}

class translate{
    const localeRu = 1;
    const localeDe = 2;
    public static $translateRu = array(
        'Number:%d' => 'Номер:%d',
        'Error'     => 'Ошибка'
    );
    public static $translateDe = array(
        'Number:%d' => 'Zahl:%d',
        'Error'     => 'Fehler'
        );
    public static $currentLocale;
    public static function getTranslateString($s){
        $st = '';
        switch( self::$currentLocale ){
            case self::localeRu: $st = self::$translateRu[$s];
                break;
            case self::localeDe: $st = self::$translateDe[$s];
                break;
        }
        if(!strlen($st)){
            $st = $s;
        }
        return $st;
    }
}

translate::$currentLocale = translate::localeDe;

try {
    throw new translateException('Number:%d', 1);
    throw new translateException('Number:%d, String:%s', array(1, 'abc'));
    throw new translateException('Error');
} catch (translateException $e) {
    echo $e->getTranslateMessage();
}