Add count_label for absence reason

aleksis/apps/kolego/models/absence.py

@@ -51,6 +51,10 @@ class AbsenceReason(ExtensibleModel):
         except cls.ObjectDoesNotExist:
             return cls.objects.create(default=True, short_name="u", name=_("Unexcused"))
 
+    @property
+    def count_label(self):
+        return f"reason_{self.id}_count"
+
     class Meta:
         verbose_name = _("Absence reason")
         verbose_name_plural = _("Absence reasons")