WP MU Plugin: Polylang multidomain Elementor assets URL

polylang-elementor-assets-url.php

<?php
/**
 * MU plugin. Need to be used together with regular plugin.
 *
 * Plugin Name: Polylang Elementor Cross Domain Assets URL
 * Description: Fixes cross origin domain issues with Elementor and Polylang
 * Version: 1.0
 * Author: Jory Hogeveen
 * Author URI: http://www.keraweb.nl/
 */

add_filter( 'plugins_url', function ( $url ) {
	if ( false === strpos( $url, 'elementor' ) ) {
		return $url;
	}

	$pll_options = get_option( 'polylang' );
	if ( ! isset( $pll_options['domains'] ) ) {
	// Not a multidomain configuration.
		return $url;
	}

	$domains = $pll_options['domains'];
	$host    = $_SERVER['HTTP_HOST'];

	foreach ( $domains as $domain ) {
		if ( false !== strpos( $domain, $host ) ) {
			$url_parts = parse_url( $url );
			$url = str_replace( $url_parts['host'], $host, $url );
			break;
		}
	}
	return $url;
} );

polylang-elementor-assets.php

<?php
/*
 * Non-MU plugin. Need to be used together with MU plugin.
 *
 * Based on code from @nicmare: https://github.com/polylang/polylang/issues/590#issuecomment-721782112
 *
 * Plugin Name: Polylang Elementor Cross Domain Assets
 * Description: Fixes cross origin domain issues with Elementor and Polylang
 * Version: 1.0
 * Author: Jory Hogeveen
 * Author URI: http://www.keraweb.nl/
*/

Polylang_Elementor_Assets::get_instance();

class Polylang_Elementor_Assets
{
	private static $_instance = null;

	protected $current_domain = '';
	protected $default_domain = '';
	protected $current_language = '';
	protected $default_language = '';
	protected $all_domains = array();

	protected function __construct() {
		add_action( 'init', array( $this, 'init' ) );
	}

	public function init() {
		if ( ! function_exists( 'pll_current_language' ) ) {
			return;
		}

		$return = OBJECT;
		$current_language = pll_current_language( $return );
		$default_language = pll_default_language( $return );

		if ( ! $current_language || ! $default_language ) {
			return;
		}

		$is_preview = isset( $_GET['elementor_preview'] );
		$is_editor  = ( isset( $_GET['action'] ) && 'elementor' === $_GET['action'] );

		if ( ! $is_editor && ! $is_preview ) {
			return;
		}
		$languages = pll_the_languages( array( 'raw' => true ) );

		foreach ( $languages as $language ) {
			$this->all_domains[] = $language['url'];
			if ( false !== stripos( $language['url'], $_SERVER['SERVER_NAME'] ) ) {
				$current_language = PLL()->model->get_language( $language['slug'] );
				break;
			}
		}

		$this->current_domain = $current_language->home_url;
		$this->default_domain = $default_language->home_url;
		$this->current_language = $current_language->slug;
		$this->default_language = $default_language->slug;

		add_filter( 'script_loader_src', array( $this, 'translate_url' ) );
		add_filter( 'style_loader_src', array( $this, 'translate_url' ) );

		add_filter( 'allowed_http_origins', array( $this, 'add_allowed_origins' ) );

		add_filter( 'wp_get_attachment_image_attributes', array( $this, 'check_for_src' ),10,2 );
		add_filter( 'admin_url', array( $this, 'modify_adminy_url_for_ajax' ), 10, 3 );

		add_filter( 'post_row_actions', array( $this, 'elementor_links_fix' ), 12, 2 );
		add_filter( 'page_row_actions', array( $this, 'elementor_links_fix' ), 12, 2 );

		add_filter( 'elementor/editor/localize_settings', array( $this, 'translate_url_recursive' ) );
	}

	public function translate_url( $url ) {
		return str_replace( $this->default_domain, $this->current_domain, $url );
	}

	public function translate_url_recursive( $data ) {
		if ( is_string( $data ) ) {
			$data = $this->translate_url( $data );
		} elseif ( is_array( $data ) ) {
			$data = array_map( array( $this, 'translate_url_recursive' ), $data );
		}
		return $data;
	}

	public function add_allowed_origins( $origins ) {
		$origins[] = $this->current_domain;
		$origins = array_merge( $origins, $this->all_domains );
		return $origins;
	}

	public function modify_adminy_url_for_ajax( $url, $path, $blog_id ) {
		if ( 'admin-ajax.php' == $path ) {
			return $this->translate_url( $url );
		}
		return $url;
	}

	public function check_for_src($attr, $attachment) {
		$attr['src'] = $this->translate_url( $attr['src'] );
		$attr['srcset'] = $this->translate_url( $attr['srcset'] );
		return $attr;
	}

	// change the edit and elementor-edit links in post table
	public function elementor_links_fix( $actions, $post ) {
		if(empty($actions['edit_with_elementor'])) return $actions;
		if(!function_exists("pll_get_post_language")) return $actions;

		if ( pll_get_post_language( $post->ID ) != pll_default_language() ) {
			$actions['edit'] = $this->translate_url( $actions['edit'] );
			$actions['edit_with_elementor'] = $this->translate_url( $actions['edit_with_elementor'] );
		}

		return $actions;
	}

	public static function get_instance() {
		if ( ! self::$_instance ) {
			self::$_instance = new self();
		}
		return self::$_instance;
	}
}

Hi @JoryHogeveen,
finalement ça marche avec le plugin Connect Polylang for Elementor. Je l'avais déjà testé, mais j'ai compris aujourd'hui qu'il fallait supprimer WPS Hide Login qui bloquait l'identification sur la 2e langue.
Merci d'avoir pris le temps de me répondre 😊