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"
}
} );
} );