Translate “ajaxerrors”

@abhishekfdd Hi! Really great plugin and I am surprised not more people are downloading it. Obviously it is because they have not seen your plugin and do not realize it exists! Please keep up the support!

I have one small problem. I need to translate the “ajaxerrors” which appears frontend, when you click “buy now” but have not selected a product option.

Do you know how I can do this?