I put this code in the file you told me, line 147, you can see here https://albertifoto.altervista.org
I would have liked to add the link to the comments, but I failed.
I tried the code in the child functions.php but it doesn’t work.
<div class="commenti-anteprime">
<?php
if (1 == get_comments_number()) {
printf(__('One thought on “%2$s”', 'wp-portfolio') , number_format_i18n(get_comments_number()) , '<span>' . get_the_title() . '</span>');
}
else {
printf(__('%1$s thoughts on “%2$s”', 'wp-portfolio') , number_format_i18n(get_comments_number()) , '<span>' . get_the_title() . '</span>');
}
?>
</div>