[Resolved] i want to translate a acf field in a author user profile

/**
 * WPML User Meta i18n for ACF User Fields
 * Place in your CHILD THEME's functions.php
 * Registers per-user meta in WPML String Translation and provides display helpers.
 */

if (!defined('ABSPATH')) { exit; }

/** ─────────────────────────────────────────────────────────────────────
 *  CONFIG — EDIT THESE FOR YOUR SITE
 *  ──────────────────────────────────────────────────────────────────── */
if (!defined('WPML_UMI_DOMAIN'))      define('WPML_UMI_DOMAIN', 'User Profiles'); // Domain shown in WPML → String Translation
if (!defined('WPML_UMI_STRIP_EMOJI')) define('WPML_UMI_STRIP_EMOJI', false);      // Set true if DB isn't utf8mb4 (emoji errors)
if (!defined('WPML_UMI_META_KEYS'))   define('WPML_UMI_META_KEYS', serialize(array(
    'foobar_test', // ← replace / add your user meta keys to translate, e.g., 'bio', 'tagline'
)));

/** ─────────────────────────────────────────────────────────────────────
 *  UTILITIES
 *  ──────────────────────────────────────────────────────────────────── */
if (!function_exists('wpml_umi_meta_keys')) {
    function wpml_umi_meta_keys() {
        $keys = @unserialize(WPML_UMI_META_KEYS);
        return is_array($keys) ? $keys : array();
    }
}
if (!function_exists('wpml_umi_strip_emoji')) {
    function wpml_umi_strip_emoji($text) {
        if (!$text) return $text;
        // Minimal emoji strip for non-utf8mb4 DBs
        return preg_replace('/[\x{1F300}-\x{1FAFF}\x{2600}-\x{27BF}]/u', '', $text);
    }
}

/**
 * Register a single user meta key as a WPML string.
 */
if (!function_exists('wpml_umi_register_user_meta_string')) {
    function wpml_umi_register_user_meta_string($user_id, $meta_key, $value_override = null) {
        $value = ($value_override !== null) ? $value_override : get_user_meta($user_id, $meta_key, true);
        if ($value === '' || $value === null) return;

        if (WPML_UMI_STRIP_EMOJI) {
            $value = wpml_umi_strip_emoji($value);
        }

        $name = "{$meta_key}_{$user_id}";

        // Register via WPML String Translation action API (safe if ST is active)
        if (has_action('wpml_register_single_string')) {
            do_action('wpml_register_single_string', WPML_UMI_DOMAIN, $name, $value);
        }
    }
}

/**
 * Get translated value (falls back to original if not translated).
 */
if (!function_exists('wpml_umi_user_meta_i18n')) {
    function wpml_umi_user_meta_i18n($user_id, $meta_key, $domain = WPML_UMI_DOMAIN) {
        $value = get_user_meta($user_id, $meta_key, true);
        if ($value === '' || $value === null) return '';
        $name  = "{$meta_key}_{$user_id}";

        // Ensure it's registered (idempotent)
        if (has_action('wpml_register_single_string')) {
            $maybe = WPML_UMI_STRIP_EMOJI ? wpml_umi_strip_emoji($value) : $value;
            do_action('wpml_register_single_string', $domain, $name, $maybe);
        }

        if (has_filter('wpml_translate_single_string')) {
            return apply_filters('wpml_translate_single_string', $value, $domain, $name);
        }
        return $value; // WPML ST not active → raw value
    }
}

/** ─────────────────────────────────────────────────────────────────────
 *  AUTO-REGISTRATION HOOKS
 *  ──────────────────────────────────────────────────────────────────── */

/**
 * Register the current user's meta on normal requests (quick feedback).
 */
add_action('init', function () {
    if (!has_action('wpml_register_single_string')) return;
    $user_id = get_current_user_id();
    if (!$user_id) return;

    foreach (wpml_umi_meta_keys() as $key) {
        wpml_umi_register_user_meta_string($user_id, $key);
    }
}, 20);

/**
 * Re-register when a user profile is updated in wp-admin.
 */
add_action('profile_update', function ($user_id) {
    if (!has_action('wpml_register_single_string')) return;

    foreach (wpml_umi_meta_keys() as $key) {
        wpml_umi_register_user_meta_string($user_id, $key);
    }
}, 10, 1);

/**
 * Re-register when ACF saves a user form (post_id like "user_123").
 */
add_action('acf/save_post', function ($post_id) {
    if (strpos($post_id, 'user_') !== 0) return;
    if (!has_action('wpml_register_single_string')) return;

    $user_id = (int) substr($post_id, 5);
    foreach (wpml_umi_meta_keys() as $key) {
        // If you prefer ACF's get_field(), uncomment:
        // $acf_val = function_exists('get_field') ? get_field($key, 'user_' . $user_id) : null;
        // wpml_umi_register_user_meta_string($user_id, $key, $acf_val);
        wpml_umi_register_user_meta_string($user_id, $key);
    }
}, 20);

/** ─────────────────────────────────────────────────────────────────────
 *  SHORTCODE: [wpml_user_meta key="foobar_test" user="7"]
 *  If user is omitted, uses current logged-in user.
 *  ──────────────────────────────────────────────────────────────────── */
add_shortcode('wpml_user_meta', function ($atts) {
    $a = shortcode_atts(array(
        'key'  => '',
        'user' => '',
    ), $atts, 'wpml_user_meta');

    $meta_key = sanitize_key($a['key']);
    if (!$meta_key) return '';

    $user_id = $a['user'] !== '' ? (int) $a['user'] : get_current_user_id();
    if (!$user_id) return '';

    return esc_html( wpml_umi_user_meta_i18n($user_id, $meta_key) );
});

/** ─────────────────────────────────────────────────────────────────────
 *  ONE-TIME BULK REGISTER (optional)
 *  Visit as an admin: /wp-admin/?wpml_register_user_strings=1
 *  Limit to a user:   /wp-admin/?wpml_register_user_strings=1&user=7
 *  ──────────────────────────────────────────────────────────────────── */
add_action('admin_init', function () {
    if (!is_admin() || !current_user_can('manage_options') || !isset($_GET['wpml_register_user_strings'])) return;
    if (!has_action('wpml_register_single_string')) wp_die('WPML String Translation not available.');

    $target_user = isset($_GET['user']) ? (int) $_GET['user'] : 0;
    $registered = 0;

    if ($target_user > 0) {
        foreach (wpml_umi_meta_keys() as $key) {
            wpml_umi_register_user_meta_string($target_user, $key);
            $registered++;
        }
    } else {
        // Collect users with any configured meta
        $user_ids = array();
        foreach (wpml_umi_meta_keys() as $key) {
            $users = get_users(array(
                'meta_key'     => $key,
                'meta_compare' => 'EXISTS',
                'fields'       => array('ID'),
                'number'       => 9999, // increase if needed
            ));
            foreach ($users as $u) { $user_ids[$u->ID] = true; }
        }
        foreach (array_keys($user_ids) as $uid) {
            foreach (wpml_umi_meta_keys() as $key) {
                wpml_umi_register_user_meta_string($uid, $key);
                $registered++;
            }
        }
    }

    wp_die('WPML User Meta i18n: registered strings = ' . (int) $registered);
});

// For a specific user (ID 7)
echo esc_html( wpml_umi_user_meta_i18n( 7, 'foobar_test' ) );

// For the current logged-in user
echo esc_html( wpml_umi_user_meta_i18n( get_current_user_id(), 'foobar_test' ) );

[wpml_user_meta key="foobar_test" user="7"]