{% load comments i18n %}
<form action="{% comment_form_target %}" method="post">{% csrf_token %}
  {% if next %}<input type="hidden" name="next" value="{{ next }}" />{% endif %}
  {% for field in form %}
    {% if field.is_hidden %}
      {{ field }}
    {% endif %}
    {% endfor %}
    {% if form.comment.errors %}{{ form.comment.errors }}{% endif %}
    <p{% if form.comment.errors %} class="error"{% endif %}>
    {% blocktrans with name=user.get_full_name %}Comment by {{ name }}:{% endblocktrans %}<br/>
    {{ form.comment }}<br/>
    {% if user.get_profile.private %}
    <span class="red">{% trans "Despite your privacy settings, your real name will be published with comment.<br/>There are <strong>no anonymous comments</strong>." %}</span><br/>
    {% endif %}
    <button type="submit" name="post" class="button comment icon">{% trans "Post Comment" %}</button>
  </p>
</form>


{% load comments i18n %}
<form action="{% comment_form_target %}" method="post">{% csrf_token %}
  {% if next %}<input type="hidden" name="next" value="{{ next }}" />{% endif %}
  {% for field in form %}
    {% if field.is_hidden %}
      {{ field }}
    {% endif %}
    {% endfor %}
    {% if form.comment.errors %}{{ form.comment.errors }}{% endif %}
    <p{% if form.comment.errors %} class="error"{% endif %}>
    {% blocktrans with name=user.get_full_name %}Comment by {{ name }}:{% endblocktrans %}<br/>
    {{ form.comment }}<br/>
    {% if user.get_profile.private %}
    <span class="red">{% trans "Despite your privacy settings, your real name will be published with comment.<br/>There are <strong>no anonymous comments</strong>." %}</span><br/>
    {% endif %}
    <button type="submit" name="post" class="btn"><i class="icon-comment"></i> {% trans "Post Comment" %}</button>
  </p>
</form>


Make comment submit button bootstrappy
Make comment submit button bootstrappy