CScart installation in ONE language only

I try to install cscart in only one language(Greek) but during instllation steps

ENGLISH is installed by default.

How can i built my eshop in one language as i am not going to use english.

It would be better for performance, smaller backups and maintaince…

I found and replaced the “EN” in .sql queries but would i have any problems with addons i will install in future? During upgrades?

thanks for any help