Internationalization i18n: link translated menu item to two different nodes

hello,

i read a lot, but i didn't manage ...

i have a menu-block + two languages + 2 nodes (content type webform)

in german the menu-link "Kontakt" should point to node 1 with the path:

de/kontakt (ideal: without the language prefix only "kontakt", but this is another topic)

in english the menu-link "Contact" should point to node 2 with the path:

en/contact

o.k. i can generate an english menu-item (only visible in the english site) and a german menu-item (only visible in the german site) with "translate menu"

but if i switch the language with the switcher-block they are not connected and the active-status doesn't change from "kontakt" to "contact".

how to do this in the right way?

thanks and greetings momper