How can I change the error messages which I can't find in the theme language editor?

I’m translating my whole site to a different language. I managed to successfully translate everything except for these couple of error messages you get when you try to register but don’t enter everything correctly. Is there a way to change them?

I don’t think I have to translate anything for you to understand. It’s a simple account creation form from the Taste theme. I want to translate the “Email can’t be blank” and “Password can’t be blank” errors to my language.

Thank you!

@DerekS - please check language settings in actions

you can check contact page