const messages = defineMessages({
  btnAll : { id: 'notification_purge.btn_all', defaultMessage: 'Select\nall' },
  btnNone : { id: 'notification_purge.btn_none', defaultMessage: 'Select\nnone' },
  btnInvert : { id: 'notification_purge.btn_invert', defaultMessage: 'Invert\nselection' },
  btnApply : { id: 'notification_purge.btn_apply', defaultMessage: 'Clear\nselected' },