Intervention tables and model adjustments

* adds user access relation to certain models
* adds pagination to tables
* adds checked_on/_by attributes to intervention model
* adds custom column rendering for checked and registered columns
* adds first simple index filtering of default interventions for user
* adds translations

konova/models.py

@@ -35,9 +35,9 @@ class BaseObject(BaseResource):
     """
     identifier = models.CharField(max_length=1000, null=True, blank=True)
     title = models.CharField(max_length=1000, null=True, blank=True)
-    deleted_on = models.DateTimeField(null=True)
-    deleted_by = models.ForeignKey(User, null=True, on_delete=models.SET_NULL, related_name="+")
-    comment = models.TextField()
+    deleted_on = models.DateTimeField(null=True, blank=True)
+    deleted_by = models.ForeignKey(User, null=True, blank=True, on_delete=models.SET_NULL, related_name="+")
+    comment = models.TextField(null=True, blank=True)
 
     class Meta:
         abstract = True