Menu doesn’t translate

We have a page where the main language ist german, on smartphone the menu behaves just as expected. But if you want to change to the english version of the page, the mobile menu doesnt recognize this and still shows the german menu instead of the english one.

There is no such settings for multiple languages. My idea was to edit the code so the plugin loads the correct menu depending on the selected language.

Could you tell me where in the code i can put my selection? Or do you have another idea for solving this problem?

Thanks in advance!

Max

The page I need help with: [log in to see the link]