[Ene]

You should edit eml_order_notification_subj language variable.

How to modify it:

1. Log in to the admin area
2. Go to the "Languages" section
3. Select the language in the "Edit language" selectbox.
4. Select the topic: E-mail. (E-mail for eml_, Text for :txt_, Errors for err_ etc)
5. Find the 'eml_order_notification_subj' variable and edit its value in the memo.
6. Click the "Apply changes" button.

Also you should edit the following templates:

* <xcart_dir>/skin1/mail/init_order_customer_subj.tpl
* <xcart_dir>/skin1/mail/init_order_notification_subj.tpl
* <xcart_dir>/skin1/mail/order_cust_complete_subj.tpl
* <xcart_dir>/skin1/mail/order_cust_processed_subj.tpl
* <xcart_dir>/skin1/mail/order_customer_subj.tpl
* <xcart_dir>/skin1/mail/order_notification_subj.tpl
* <xcart_dir>/skin1/mail/order_updated_customer_subj.tpl

These templates contain texts for all order notifications.