Polylang – get post language when using wp_insert_post

Hello,
I need to find post language in this function (used in functions.php) to set $lang and then define $slug_taccuino:

function automatically_name_taccuino($post_id, $post, $update) {
$desired_type = ‘taccuino’;
if(( !in_array( $data[‘post_status’], array( ‘draft’, ‘pending’, ‘auto-draft’ ) ) ) && $desired_type === $post->post_type) {
if ( $lang === ‘it’ ) {
$slug_taccuino = ‘taccuino’;
}
if ( $lang === ‘en’ ) {
$slug_taccuino = ‘notebook’;
}
if ( $lang === ‘fr’ ) {
$slug_taccuino = ‘cahier’;
}

$keep_title = get_the_title();
$keep_post_id = get_the_ID();
$date_slug = get_the_date(‘Y-m-d’);
$post_title_parts = array();
$post_title_parts[] = $keep_title;
$post_title_parts[] = $slug_taccuino;
$post_title = implode(‘ – ‘, array_filter(array_map(‘trim’, $post_title_parts)));
$post_name = sanitize_title($post_title, $post_id);
global $wpdb;
$wpdb->update($wpdb->posts, array(‘post_name’ => $post_name), array(‘ID’ => $post_id));
}
}
add_action(‘wp_insert_post’, ‘automatically_name_taccuino’, 11, 3);

Any help is appreciated!