Hello, @Bas Kling,
Actually, I just edit your site header and set the widgets of my account and cart to show the language dropdown without any issues as you can see in the image: https://postimg.cc/zLgcy2nd and now check back to your site after clearing the browser cache. Check the resulting image: https://postimg.cc/Bj8hz7wq
Regards 8Themes Team.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.