Disabling Menu Items for some languages

Hello,

The default language in my Drupal8 system is German. Content and User interface is also translated into English and Italian. However, some menu items are only supposed to be shown in German, they are irrevelant in the other languages. How do I do this? I use the latest version of Superfish. When I set a translated menu item from published to “unpublished” the menu item is STILL displayed, but the German text for the item is shown. When I disable the “show expanded (in all languages)” button, then of course NOTHING (not even the German version) is shown. This is NOT what I want. How to I go about to achieve what I want?
Regards 
H. Stoellinger

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed