[Closed] Translation of code snippet

Hi,

I add a custom snippet with WPCode Snippet plugin which is:

add_action( 'wp_footer', 'wc_modify_variation_atc_text' );
function wc_modify_variation_atc_text() {
?>
<script type="text/javascript">
(function( $ ) {
var $form = $( '.product form.variations_form' );
$form.find( '.single_add_to_cart_button' ).html('Sélectionner une longueur');
$form.on( 'show_variation', function( event, variation, purchasable ) {
$form.find( '.single_add_to_cart_button' ).html('Ajouter au panier');
} );
} )( jQuery );
</script>
<?php
}

I changed text from add to cart button for variable product before customer select variant then the button back to text "add to cart".

How can I add string to these? I need to translate "Sélectionner une longueur" (select lenght) and "Ajouter au panier" (add to cart)

Thanks a lot !!