Change Gravity Forms name labels from "First" and "Last" to "First Name" and "Last Name"

first_name_last_name_gravity_forms.php

<?php
function gf_change_first_name( $label, $form_id ){
    return "First Name";
}
add_filter( 'gform_name_first', 'gf_change_first_name', 10, 2 );

function gf_change_last_name( $label, $form_id ){
    return "Last Name";
}
add_filter( 'gform_name_last', 'gf_change_last_name', 10, 2 );