Default group required

* adds access checks depending on the current group confgiguration of a user
* removes buttons for adding/editing or removing data if default group is not set for a user
* removes buttons for adding/removing related data in unshared interventions
* removes shared-user setting from share menu of an intervention if user is not zb or ets
* renames has_access() from intervention Model into is_shared_with() for more clarity
* fixes bug in group check in_group() from utils.py

konova/utils/user_checks.py

@@ -5,6 +5,7 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 02.07.21
 
 """
+from django.utils.translation import gettext_lazy as _
 from django.contrib.auth.models import User
 
 
@@ -18,4 +19,6 @@ def in_group(user: User, group: str) -> bool:
     Returns:
         bool
     """
-    return group in user.groups.values("name")
+    return user.groups.filter(
+        name=_(group)
+    )