Translate ACF Media with WPML

translate_wpml_media_acf.php

<?php
/**
 * Make Media attachments translatable with WPML
 *
 * Filter ACF images and galleries to switch attachment ids with their
 * corresponding WPML translation.
 */
add_filter( 'acf/load_value/type=gallery', 'my_acf_load_translated_attachment', 10, 3 );
add_filter( 'acf/load_value/type=image', 'my_acf_load_translated_attachment', 10, 3 );

function my_acf_load_translated_attachment($value, $post_id, $field) {
    $newValue = $value;

    // Make sure we are using WPML
    if ( function_exists('icl_object_id') ) {
        // Galleries come in arrays
        if ( is_array($value) ) {
            $newValue = array();
            foreach ($value as $key => $id) {
                $newValue[$key] = icl_object_id($id, 'attachment');
            }
        }
        // Single images arrive as simple values
        else {
            $newValue = icl_object_id($value, 'attachment');
        }
    }

    return $newValue;
}