How to use only one languange when i add a category/post

Hello im new in opencart,

i have install the latest version 1.5.1.3. I habe install the greek language.

When im trying to add a category or a post in greek i have to add it in greek and in english too! and i dont want that.

I wanna use only the greek language.

Is that possible? I disable the english language from localization with no luck

Thank you for your time

Try deleting the English language from localization all together.

Not allowed to do that..