Hi,
I guess that is link with the language loader in HikaMarket.
In the file "administrator/components/com_hikamarket/classes/mail.php" please replace
	$mail = $shopMailClass->get('order_status_notification', $order);
	$mail->hikamarket = true;
	$this->loadLocale(false, $locale);By
	$mail = $shopMailClass->get('order_status_notification', $order);
	$mail->hikamarket = true;
	$mail_order_status = hikamarket::orderStatus($order->mail_status);
	$this->loadLocale(false, $locale);
And also
	$mail->subject = JText::sprintf($mail->subject, $order->order_number, hikamarket::orderStatus($order->mail_status), HIKASHOP_LIVE);
	$ret = $shopMailClass->sendMail($mail);
By
	$mail->subject = JText::sprintf($mail->subject, $order->order_number, $mail_order_status, HIKASHOP_LIVE);
	$ret = $shopMailClass->sendMail($mail);
It will translate the order status before the reset of the language.
Regards,