Encoding issue

Again, we are having issues. I think I fixed the problem. I also created tests that reproduce the issue.

This merge request also has some fixes for the provenance box, to properly sort the rows and display dates.

smash/web/forms/appointment_form.py

@@ -48,10 +48,10 @@ class AppointmentForm(ModelForm):
                 description = '{} changed from "{}" to "{}"'.format(field, old_human_values, new_human_values)
             else:
                 if self.instance.id:  # update instance
-                    previous_value = str(getattr(self.instance, field))
+                    previous_value = getattr(self.instance, field)
                 else:
                     previous_value = ''
-                new_value = str(self.cleaned_data[field])
+                new_value = self.cleaned_data[field]
                 description = u'{} changed from "{}" to "{}"'.format(field, previous_value, new_value)
 
             p = Provenance(modified_table=Appointment._meta.db_table,