#49 Frontend rendering

* adds rendering for detail view
* adds new includable html snippet for parcel rendering
* refactors generic includables in konova/ app into konova/templates/includes/...
* fixes bug where parcels have been reused from the database due to wrong model structure
* adds get_underlying_parcels() for Geometry model
* adds get_underlying_parcels() for GeoReferencedMixin models
* fixes bug where missing geometry would lead to an error during geometry conflict check
* removes unused wfs attribute from AbstractWFSFetcher
* adds/updates translations

konova/models/object.py

@@ -420,13 +420,29 @@ class GeoReferencedMixin(models.Model):
     class Meta:
         abstract = True
 
-    def _set_geometry_conflict_message(self, request: HttpRequest):
+    def get_underlying_parcels(self):
+        """ Getter for related parcels
+
+        Returns:
+            parcels (Iterable): An empty list or a Queryset
+        """
+        if self.geometry is not None:
+            return self.geometry.get_underlying_parcels()
+        else:
+            return []
+
+    def set_geometry_conflict_message(self, request: HttpRequest):
+        if self.geometry is None:
+            return request
+
         instance_objs = []
         add_message = False
         conflicts = self.geometry.conflicts_geometries.all()
+
         for conflict in conflicts:
             instance_objs += conflict.affected_geometry.get_data_objects()
             add_message = True
+
         conflicts = self.geometry.conflicted_by_geometries.all()
         for conflict in conflicts:
             instance_objs += conflict.conflicting_geometry.get_data_objects()