franca-theme-blog/templates/components/image.j2

{% if post.image %}
    <p>
        {% if home or section %}
            <a href="/{{ language }}{{ url }}" rel="permalink" title="{{ image_title }}">
                <img data-src="{{ post.thumbnail }}" alt="{{ image_title }}" class="home-image lozad" />
            </a>
        {% else %}
            <img data-src="{{ post.image }}" alt="{{ image_title }}" class="post-image lozad" />
        {% endif %}
    </p>
{% endif %}