I want customer to be able to use only Greek language but as admin i want to use english. Is that possible at all?
Thank you for your message.
I suppose that you have only two languages created in your CS-Cart admin panel. In this case you should go to Administration > Languages > Languages in your CS-Cart admin panel and switch the English language status to Hidden. After this both the Greek and English languages will be available in your CS-Cart admin panel but only the Greek language will be available for your customers in the storefront.
Please check it.
CS-Cart Support team