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.

{{ object.title }}
{{ object.submitter.username }}
{{ object.submitter.get_full_name }}
{{ object.short_text }}
{{ object.long_text }}
{{ object.tags }}