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function replace_text_title($text) {
  if(is_page(25032)){
    $text = str_replace('matrimonio gay', 'unione civile', $text);
    //$text = str_replace('look-for-that-string', 'replace-with-that-string', $text);

  return $text;
  }
}
add_filter('the_title', 'replace_text_title');