Fixing #230; add a scrollbar to the PM popup dialog if necessary. This wasn't as easy as I thought. Had to wrap the PM text in a div with its styling (max-height and overflow). If I then resized the dialog, I'd get two scrollbars. So for now, made the dialog non-resizable.

{% extends 'base.html' %}
{% block title %}Thanks For The Feedback{% endblock %}
{% block content %}
<h2>Your Message Has Been Sent</h2>
<p>Thank you for the message, it has been emailed to the site management.</p>
{% endblock %}