Changing widget language

Hi all,

I recently bought a premium theme for my barbershop. I’m really happy with it but I got a small issue. In the theme was a widget included that allows people to make an appointment online. It’s an awesome tool but all the descriptions are in English unfortunately. Because there were a few complaints from costumers not understanding the language, I wanted to ask how I can change that? The text needs to be converted to Belgian language.
I’ve been searching but there is nowhere to find the file of the widget..

Thanks in advance 😉