pyfedi/app/templates/post/add_reply_inline.html

<form>
    <div class="row">
        <div class="col">
                <textarea name="body" class="form-control" rows="5" autofocus="autofocus" required="required" aria-required="true"></textarea>
        </div>
    </div>
    <div class="row mb-3">
        <div class="col-8">
            <a href="#"
                   class="btn btn-primary mt-2"
                   hx-post="{{ url_for('post.add_reply_inline', post_id=post_id, comment_id=comment_id) }}"
                   hx-target="#reply_to_{{ comment_id }}"
                   hx-swap="outerHTML"
                >{{ _('Comment') }}</a>
        </div>
        <div class="col-4 text-right">
            <select name="language_id" class="form-select mt-2">
                {% for language in languages %}
                    <option value="{{ language[0] }}">{{ language[1] }}</option>
                {% endfor %}
            </select>
        </div>
    </div>
</form>