WooCommerce Checkout Add-ons - Enable WPML translation of labels, names, and options

checkout-add-ons.php

<?php

function sv_wc_checkout_add_ons_wpml_translate( $label ) {
	return apply_filters( 'translate_string', $label, 'woocommerce-checkout-add-ons', $label );
}
add_filter( 'woocommerce_checkout_add_on_get_name', 'sv_wc_checkout_add_ons_wpml_translate' );
add_filter( 'woocommerce_checkout_add_on_get_label', 'sv_wc_checkout_add_ons_wpml_translate' );

function sv_wc_checkout_add_ons_options_wpml_translate( $options ) {

	$translated_options = array();

	foreach ( $options as $option ) {
		$option['label'] = apply_filters( 'translate_string', $option['label'], 'woocommerce-checkout-add-ons', $option['label'] );
		$translated_options[] = $option;
	}

	return $translated_options;
}
add_filter( 'woocommerce_checkout_add_on_get_options', 'sv_wc_checkout_add_ons_options_wpml_translate' );

Can't get them to register, do I need to change something in the functions file?