captcha-module/Application/views/admin_smarty/de/oe_captcha_admin_de_lang.php

<?php

$sLangName = 'Deutsch';

$aLang     = [
    'charset'                  => 'UTF-8',
    'SHOP_MODULE_GROUP_main'   => 'Allgemein',
    'SHOP_MODULE_oecaptchakey' => 'Captcha Key',
];