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<?php

// basic usage
add_filter( 'gpnf_item_labels', 'my_item_labels' );
function my_item_labels() {
    return array(
        'singular' => __( 'employee', 'gravityperks' ),
        'plural'   => __( 'employees', 'gravityperks' )
    );
}

// form-specific usage
add_filter( 'gpnf_item_labels_1', 'my_item_labels_for_form_id_1' );
function my_item_labels_for_form_id_1() {
    return array(
        'singular' => __( 'employee', 'gravityperks' ),
        'plural'   => __( 'employees', 'gravityperks' )
    );
}