doitinpoland.com/wp-content/plugins/wpml-media-translation/templates/media-selector/media-selector.twig

{% for id, file in files %}
    <label>
        <span class="wpml-media-selector-zoom{% if file.translated %} translated{% endif %}">
        <img src="{{ file.thumbnail }}" title="{{ file.name }}" alt="{{ file.name }}"/>
        </span>
        <input type="checkbox" name="post[{{ post_id }}][media-translation][]" value="{{ id }}"/>
    </label>
{% endfor %}