message: feat(explore): change save button text when users cannot override
diff: @@ -232,7 +232,9 @@ class SaveModal extends React.Component {
  disabled={!this.state.newSliceName}
  data-test="btn-modal-save"
  >
  - {t('Save')}
  + {!this.props.can_overwrite && this.props.slice
  + ? t('Save as new chart')
  + : t('Save')}
  </Button>
  </div>
  </Modal.Footer>
  