How to translate formbuilder submission errors?

[vlad-m]

I am using the latest version of FormBuilder and it works just perfect. The only thing I cracked my head about is how to translate form submissin errors.
I want to translate the message:
Please enter a value for into my language
But I can not find it anywhere in templates
Could anybody help me please.
Thank you

[webform]

I think you find it in the language files.