The apps in the group view do not work with multilingual communities. They only work in the English version. For example, on the group page if I select on the left side in column the app Disscusions in the German version and then with a click in the field New Disscusion, the group overview is loaded and not the input mask new discussion. The same happens with the other apps like Tasks in the German view: if I select the app Tasks in the German version and then with a click select an existing task, the group overview page is loaded.
I run another ES2 application only in the German language. Here too, for example, I can not create a new discussion with the App Disscussions.
One more question. In the Apps view events, polls, tasks, and announcements, why is no selection field like new event, new poll, new announcement available?