docs: def init_common(app):
      """Post initialization."""
      if app.config['USERPROFILES_EXTEND_SECURITY_FORMS']:
          security_ext = app.extensions['security']
          security_ext.confirm_register_form = confirm_register_form_factory(
              security_ext.confirm_register_form)
          security_ext.register_form = register_form_factory(
              security_ext.register_form)