Где неправильность в том, что "locale" это bool?
$polylang->curlang - bool (false)if ($polylang->curlang) {
  $polylang->curlang->locale = ...
}<video autoplay="" muted="" loop="" disablepictureinpicture="" webkit-playsinline="" playsinline="" pip="false" poster="poster.jpg">
      <source type="video/mp4" src="video.mp4">
    </video>video {
  background-color: transparent;
  border-bottom: 1px solid transparent; /* хак для предотвращения мелькания при загрузке на некоторых версиях ios */
  &::-webkit-media-controls-panel {
    display: none !important;
    -webkit-appearance: none;
    opacity: 0;
    visibility: hidden;
  }
  &::-webkit-media-controls-play-button {
    display: none !important;
    -webkit-appearance: none;
    opacity: 0;
    visibility: hidden;
  }
  &::-webkit-media-controls-start-playback-button {
    display: none !important;
    -webkit-appearance: none;
    opacity: 0;
    visibility: hidden;
  }
}      function get_child_category_list( $parent_id, $level = 0 ) {
    $args = array(
        'hierarchical' => 1,
        'show_option_none' => '',
        'hide_empty' => 0,
        'parent' => $parent_id,
        'taxonomy' => 'product_cat'
    );
    $subcategories = get_categories( $args );
    if ( $subcategories ) {
        $output = '<ul class="subcategories level-' . $level . '">';
        foreach ( $subcategories as $category ) {
            $output .= '<li>';
            $output .= '<a href="' . get_term_link( $category ) . '">' . $category->name . '</a>';
            $output .= get_child_category_list( $category->term_id, $level + 1 );
            $output .= '</li>';
        }
        $output .= '</ul>';
        return $output;
    } else {
        return '';
    }
}if ( is_product_category() ) {
    $parent_id = get_queried_object_id();
    echo get_child_category_list( $parent_id );
}      the_post_thumbnail() или get_the_post_thumbnail()$size = 'post-thumbnail';
$attr = array(
	'class' => 'attachment-' . $size,
	'alt'   => the_title_attribute(),
);
the_post_thumbnail( $size, $attr );.attr() нужно передавать переменную, а не строкуjQuery( 'img' ).attr( 'title', image_alt );      //функция для изменения цен с помощью числа
function wpp_price_plus() {
    return 100;
}
add_filter('woocommerce_product_variation_get_regular_price', 'wpp_custom_price', 99, 2 );
add_filter('woocommerce_product_variation_get_price', 'wpp_custom_price', 99, 2 );
function wpp_custom_price( $price, $product ) {
    return (float) $price + wpp_price_plus();
}
add_filter('woocommerce_variation_prices_price', 'wpp_custom_variable_price', 99, 3 );
add_filter('woocommerce_variation_prices_regular_price', 'wpp_custom_variable_price', 99, 3 );
function wpp_custom_variable_price( $price, $variation, $product ) {
     // Удаление кэшированной цены продукта
    wc_delete_product_transients($variation->get_id());
    return (float) $price + wpp_price_plus();
}
// Обработка кэширования цен
add_filter( 'woocommerce_get_variation_prices_hash', 'add_price_plus_to_variation_prices_hash', 99, 3 );
function add_price_plus_to_variation_prices_hash( $price_hash, $product, $for_display ) {
    $price_hash[] = wpp_price_plus();
    return $price_hash;
}      Подсмотрел в гайд, вот здесь, здесь есть образец создания класса-контрола в самом начале, но простого нотиса, который ничего не позволяет менять
<?php
if(!defined('ABSPATH')){exit;}
class Skyrocket_TinyMCE_Custom_control extends WP_Customize_Control{
	/**
	 * The type of control being rendered
	 */
	public $type = 'tinymce_editor';
	/**
	 * Enqueue our scripts and styles
	 */
	public function enqueue(){
		wp_enqueue_script( 'skyrocket-custom-controls-js', get_template_directory_uri() . '/js/customizer.js', array( 'jquery' ), '1.0', true );
		wp_enqueue_style( 'skyrocket-custom-controls-css', get_template_directory_uri() . '/css/customizer.css', array(), '1.0', 'all' );
		wp_enqueue_editor();
	}
	/**
	 * Pass our TinyMCE toolbar string to JavaScript
	 */
	public function to_json() {
		parent::to_json();
		$this->json['skyrockettinymcetoolbar1'] = isset( $this->input_attrs['toolbar1'] ) ? esc_attr( $this->input_attrs['toolbar1'] ) : 'bold italic bullist numlist alignleft aligncenter alignright link';
		$this->json['skyrockettinymcetoolbar2'] = isset( $this->input_attrs['toolbar2'] ) ? esc_attr( $this->input_attrs['toolbar2'] ) : '';
		$this->json['skyrocketmediabuttons'] = isset( $this->input_attrs['mediaButtons'] ) && ( $this->input_attrs['mediaButtons'] === true ) ? true : false;
	}
	/**
	 * Render the control in the customizer
	 */
	public function render_content(){
	?>
		<div class="tinymce-control">
			<span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
			<?php if( !empty( $this->description ) ) { ?>
				<span class="customize-control-description"><?php echo esc_html( $this->description ); ?></span>
			<?php } ?>
			<textarea id="<?php echo esc_attr( $this->id ); ?>" class="customize-control-tinymce-editor" <?php $this->link(); ?>><?php echo esc_attr( $this->value() ); ?></textarea>
		</div>
	<?php
	}
}/* ==========================================================================
   Textarea/TinyMCE
   ========================================================================== */
.tinymce-control textarea {
	width: 100%;
	padding: 10px;
}jQuery( document ).ready(function($) {
	"use strict";
	/**
	 * TinyMCE Custom Control
	 *
	 * @author Anthony Hortin <http://maddisondesigns.com>
	 * @license http://www.gnu.org/licenses/gpl-2.0.html
	 * @link https://github.com/maddisondesigns
	 */
	$('.customize-control-tinymce-editor').each(function(){
		// Get the toolbar strings that were passed from the PHP Class
		var tinyMCEToolbar1String = _wpCustomizeSettings.controls[$(this).attr('id')].skyrockettinymcetoolbar1;
		var tinyMCEToolbar2String = _wpCustomizeSettings.controls[$(this).attr('id')].skyrockettinymcetoolbar2;
		var tinyMCEMediaButtons = _wpCustomizeSettings.controls[$(this).attr('id')].skyrocketmediabuttons;
		wp.editor.initialize( $(this).attr('id'), {
			tinymce: {
				wpautop: true,
				toolbar1: tinyMCEToolbar1String,
				toolbar2: tinyMCEToolbar2String
			},
			quicktags: true,
			mediaButtons: tinyMCEMediaButtons
		});
	});
	$(document).on( 'tinymce-editor-init', function( event, editor ) {
		editor.on('change', function(e) {
			tinyMCE.triggerSave();
			$('#'+editor.id).trigger('change');
		});
	});
});...
$customizer->add_setting( 'sample_tinymce_editor',
   array(
      'default' => '',
      // 'transport' => 'postMessage',
      'sanitize_callback' => 'wp_kses_post'
   )
);
$customizer->add_control( new Skyrocket_TinyMCE_Custom_control( $customizer, 'sample_tinymce_editor',
   array(
      'label' => __( 'TinyMCE Control' ),
      'description' => __( 'This is a TinyMCE Editor Custom Control' ),
      'section' => 'section_VAB_Agree',
      'input_attrs' => array(
         'toolbar1' => 'bold italic bullist numlist alignleft aligncenter alignright link',
         'mediaButtons' => true,
      )
   )
));
...echo get_theme_mod('sample_tinymce_editor');

  
  <filter id="filter0_b_601_49" x="93.425" y="129.676" width="237" height="445.648" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
      <feFlood flood-opacity="0" result="BackgroundImageFix"></feFlood>
-      <feGaussianBlur in="BackgroundImage" stdDeviation="25"></feGaussianBlur>
+      <feGaussianBlur in="BackgroundImageFix" stdDeviation="25"></feGaussianBlur>
      <feComposite in2="SourceAlpha" operator="in" result="effect1_backgroundBlur_601:49"></feComposite>
      <feBlend mode="normal" in="SourceGraphic" in2="effect1_backgroundBlur_601:49" result="shape"></feBlend>
    </filter>