First email is translated, next are not.

Hello,

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Hi @mystertaran did you solve this issue?

hi @lostguybrazil . Unfortunetly not, my customer decide to switch from Woo to Shopify.

Hi @mystertaran, I tried to solve this issue today with the following code. Unfortunately it did not work.

// WooCommerce - Order email notifications language set based on order using Polylang
// Last update: 2024-08-27


if (class_exists('WooCommerce') && WC() && class_exists('Polylang')) {

    add_action($hook_name = 'woocommerce_email_header', $callback = 'set_email_language_based_on_order', $priority = 10, $accepted_args = 2);

    function set_email_language_based_on_order($email_heading, $email)
    {
        // Ensure it's an order-related email
        if (isset($email->object) && is_a($email->object, 'WC_Order')) {
            $order = $email->object;
            $order_language = pll_get_post_language($order->get_id());
            $current_language = pll_current_language(); // Get the current language

            if ($order_language && $order_language !== $current_language) {
                // Switch language if it's different from the current language
                pll_switch_language($order_language);
            }
        }
    }

    add_action($hook_name = 'woocommerce_email_footer', $callback = 'restore_language_after_email', $priority = 10, $accepted_args = 1);

    function restore_language_after_email($email)
    {
        // Restore the language to the default or previously active language
        pll_restore_previous_language();
    }
}

Hi @mystertaran, I have solved this issue.

I retrieve the language in which the order was placed in Polylang (pll_get_post_language($order->get_id(), 'slug')) and then I temporary switch the locale (switch_to_locale($order_locale)) so that the email is send in the correct language. It’s similar to the approach described in the Polylang documentation.

Please find the code below – the // Check if the object is a Shipment or Invoice from Germanized for WooCommerce part can be removed as it’s specific for the Germanized for WooCommerce plugin.

<?php

// WooCommerce - Order email notifications language set based on order using Polylang
// Last update: 2024-08-29


// To prevent issues where simultaneous purchases by different users in different languages might result in email notifications being sent in the wrong language, the code avoids using global variables. Instead, it handles locale switching in an isolated manner for each request.


if (class_exists('WooCommerce') && WC() && class_exists('Polylang')) {

    class WC_Email_Locale_Handler
    {
        public function __construct()
        {
            // Hook into the email header to switch locale before email content
            add_action($hook_name = 'woocommerce_email_header', $callback = [$this, 'set_email_locale_based_on_order'], $priority = 10, $accepted_args = 2);

            // Hook into the email footer to restore the original locale after email content
            add_action($hook_name = 'woocommerce_email_footer', $callback = [$this, 'restore_email_locale'], $priority = 10, $accepted_args = 1);

            // Hook into resending emails to handle locale switching
            add_action($hook_name = 'woocommerce_before_resend_order_emails', $callback = [$this, 'set_locale_before_resending_email'], $priority = 10, $accepted_args = 1);
        }

        public function set_email_locale_based_on_order($email_heading, $email)
        {
            if (isset($email->object)) {
                // Get the language locale of the order
                $order_locale = $this->get_locale_from_object($email->object);

                if ($order_locale) {
                    // Switch to the order's locale
                    switch_to_locale($order_locale);
                }
            }
        }

        public function restore_email_locale()
        {
            restore_previous_locale();
        }

        public function set_locale_before_resending_email($order)
        {
            if ($order) {
                // Get the language locale of the order
                $order_locale = $this->get_locale_from_object($order);

                if ($order_locale) {
                    // Switch to the order's locale
                    switch_to_locale($order_locale);
                }
            }
        }

        private function map_language_to_locale($language_slug)
        {
            // Define a mapping of language slugs to locale codes
            $mapping = array(
                'de' => 'de_DE',
                'en' => 'en_US',
                'pt' => 'pt_BR',
                // Add more languages as needed
            );

            return isset($mapping[$language_slug]) ? $mapping[$language_slug] : false;
        }

        private function get_locale_from_object($object)
        {
            $order = null;

            // Check if the object is a WC_Order
            if (is_a($object, 'WC_Order')) {
                $order = $object;
            }

            // Check if the object is a Shipment or Invoice from Germanized for WooCommerce
            elseif (is_a($object, 'Vendidero\Germanized\Shipments\Shipment') || is_a($object, 'Vendidero\StoreaBill\Invoice\Invoice')) {
                $order = $object->get_order();
            }

            if ($order && function_exists('pll_get_post_language')) {
                // Get the language slug of the order
                $order_language = pll_get_post_language($order->get_id(), 'slug');

                // Map the language slug to a locale code
                return $this->map_language_to_locale($order_language);
            }

            return null;
        }
    }

    // Initialize the handler class
    new WC_Email_Locale_Handler();
}

I had to make some changes to work also with the email subject and email content heading. For reference, the updated code can be found here: https://stackoverflow.com/a/79002683/9195104