Permission rethinking

* No detailed permissions due to django constraints on model-based permissions
* instead: logic controlled permission by group membership
* adds translations

konova/contexts.py

@@ -26,7 +26,6 @@ class BaseContext:
     def __init__(self, request: HttpRequest, additional_context: dict = {}):
         self.context["language"] = request.LANGUAGE_CODE
         self.context["user"] = request.user
-        self.__handle_current_role(request)
 
         # Add additional context, derived from given parameters
         self.context.update(additional_context)