[Resolved] Translating captcha text

That is a Google reCAPTCHA iframe. The src attribute points to hidden link?..., which is the official Google reCAPTCHA service.

The reCAPTCHA widget’s language is controlled by Google’s API parameters and from what I see, you don't have a plugin for this, it is not even part of the Elementoror template for this page hidden link, this is all coded directly into the theme template files (function call for the reCAPTCHA).
hidden link

WPML (or any other multilingual plugin for that matter) can translate your site’s content, but they do not translate the Google reCAPTCHA widget itself.

I see that on arabic there is a "window.onload_recaptcha_callback is not defined. Check functions.php for reCAPTCHA script enqueue and inline script." error recorded in the console.

That error usually happens when reCAPTCHA is being loaded twice (once by default, once by your code) or when WPML changes the page language, but the onload callback is not defined before reCAPTCHA tries to run. In this case it is likely the later.

Is it all coded here?
hidden link

I guess it is like this?

<?php if ( ! empty( $recaptcha_site_key ) ) : ?>
    <div id="recaptcha-login-container"
         class="g-recaptcha"
         data-sitekey="<?php echo esc_attr( $recaptcha_site_key ); ?>"
         data-callback="recaptcha_login_callback">
    </div>

    <input type="hidden"
           name="recaptcha_response_login"
           id="recaptcha_response_login">
<?php endif; ?>

Maybe something like this could work (add all of this into the functions.php):

function add_recaptcha_callback_script() {
    ?>
    <script>
        function recaptcha_login_callback(token) {
            // Save the token into hidden field
            document.getElementById('recaptcha_response_login').value = token;
        }
    </script>
    <?php
}
add_action('wp_footer', 'add_recaptcha_callback_script');

function load_recaptcha_with_language() {
    if ( defined('ICL_LANGUAGE_CODE') ) {
        $lang = ICL_LANGUAGE_CODE; // WPML language code (e.g. ar, en, fr)
    } else {
        $lang = 'en'; // fallback
    }

    wp_enqueue_script(
        'google-recaptcha',
        '<em><u>hidden link</u></em>' . esc_attr($lang),
        array(),
        null,
        true
    );
}
add_action('wp_enqueue_scripts', 'load_recaptcha_with_language');

But this is just a possible theory. Given that all this is coded directly into the theme, so quite a lot of custom code which we don't support according to our support rules, can you check with developers of the theme about this?

Let me know what they say, in case they are unable to resolve it.

I’m glad to hear the suggestions are with the developer. They should serve as a solid starting point, though some adjustments may be required depending on the setup. If any clarification or further support is needed during implementation, please let me know.