Изменяю og:locale:alternate в wp_head с помощью yoast seo

add_action('get_header', 'blog_template_add_ob_start');
add_action('wp_head', 'blog_template_add_ob_end_flush', 100);
function blog_template_add_ob_start() {
  ob_start('blog_template_add_filter_wp_head_output');
}
function blog_template_add_ob_end_flush() {
  ob_end_flush();
}
function blog_template_add_filter_wp_head_output($output) {
  $output = str_ireplace('<meta property="og:locale:alternate" content="ru_RU" />', '<meta property="og:locale:alternate" content="ru_UA" />', $output);
  return $output;
}