Thank you very much, I’ll check it out.

Anyway fix the problem.

3- It occurred to me to replace the line:
<h1 class=”page-title”>’. esc_html( $template_title ) .'</h1>
for this:
<h1 class=”page-title”>’. ( $template_title ) .'</h1>
in custom-header.php.

Apparently it is a common problem to other wp themes. Thank you very much for your help! and sorry for my bad english