Disabled controls should have both the disabled attribute and aria-disabled="true"

<label for="language">Language</label>
<select name="language" id="language" disabled>
    <option value="de">Deutsch</option>
    <option value="en">English</option>
    <option value="es">Español</option>
    <option value="fr">Français</option>
    <option value="hi-IN">हिन्दी (भारत)</option>
    <option value="ja">日本語</option>
</select>