code: func (ui *UI) DisplayWarning(template string, templateValues ...map[string]interface{}) {
  	fmt.Fprintf(ui.Err, "%s\n\n", ui.TranslateText(template, templateValues...))
  }
docs: // DisplayWarning translates the warning, substitutes in templateValues, and
  // outputs to ui.Err. Only the first map in templateValues is used.