hillekamp Hi
Like what you did when creating menus / modules for 3 languages, you need to create template style for each language too.
I just duplicated the default template style of GK Arty template to have a new one >> rename it as GK Arty - DE and assign main menu of DE + assign to these menu item pages and you can see the menu is working now.
![](https://www.joomlart.com/forums/assets/files/2023-02-07/1675752805-264937-screenshot-2023-02-07-at-15251-pm.png)
You can do the same for other languages.