N/ui/serverWidget Module
Button.label
Property Description: The label for the button. You can use this property to rename a button based on context, for example to re-label a button for particular users that are viewing a page. This property is supported on custom buttons and most standard buttons.
Type: string
Supported Script Types: SuiteScript 2.0 Suitelet Script Type and SuiteScript 2.0 User Event Script Type (beforeLoad(scriptContext))
Module: N/ui/serverWidget Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Button.label

// Code Example 1

//Add additional code

//...

var form = serverWidget.createForm({

    title : 'Simple Form'

});

var button = form.addButton({

    id : 'buttonid',

    label : 'Test'

});

var label = button.label;

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4325807686.html