Fix some old import problems where I used 'from django.contrib import auth' instead of 'from django.contrib.auth.models import User'. Also some formatting changes while I was in there.

{% if show_button %}
<a href="{% url forums-edit_post id=post.id %}"><img src="{{ MEDIA_URL }}icons/page_edit.png" alt="Edit post" title="Edit post" /></a>
{% endif %}