docs: def make_localised_form(model, form, exclude=None):
      """
      This is a factory function that creates a form for a model with internationalised 
      field. The model should be decorated with the L10N decorater.
      """
      
      newfields = {}  
      
      for localized_field in model.localized_fields:
          # get the descriptor, which contains the form field
          default_field_descriptor = getattr(model, localized_field)
          
          # See if we've got overridden fields in a custom form.
          if hasattr(form, 'declared_fields'):
              form_field = form.declared_fields.get(
                  localized_field, default_field_descriptor.form_field)
          else:
              form_field = default_field_descriptor.form_field
           
          # wrap the widget to show the origin of the value;
          # either database, catalog or fallback.
          if type(form_field.widget) is not WidgetWrapper:
              form_field.widget = WidgetWrapper(form_field.widget)
           
          newfields[localized_field] = form_field
   
      if hasattr(form, 'Meta'):
           setattr(form.Meta, 'model', model)
      else:
           newfields['Meta'] = type('Meta', tuple(), {'model':model})
      
      newfields['localized_fields'] = model.localized_fields
      
      return ModelFormMetaclass(model.__name__, (LocalisedForm, form), newfields)