You may wish to use your own text in the ColVis button - this is done by making use of the oColVis.buttonText DataTables initialisation parameter, as shown in this example.
$(document).ready( function () {
	$('#example').dataTable( {
		"sDom": 'C<"clear">lfrtip',
		"oColVis": {
			"buttonText": "Change columns"
		}
	} );
} );