Add labels for normal backorder and in stock products

backorder-stock-labels.php

add_action( 'tmpl-pc-configurator-choice-item--after', 'hexatac_add_choice_out_of_stock_label' );
function hexatac_add_choice_out_of_stock_label() {
    echo ' <# if ( data.manage_stock && \'none\' !== data.manage_stock && 0 >= data.stock ) { #>
        <# if ( data.wc_backorder && "yes" == data.wc_backorder ) { #>
            <span class="out-of-stock backorder">Sur commande</span>
        <# } #>
	<# } else if ( data.manage_stock && \'none\' !== data.manage_stock && 0 < data.stock ) { #>
		<span class="out-of-stock en-stock">En stock</span>
	<# } #>';
}