allow white space to wrap to avoid horizontal scroll for group listing and activities

Currently (in Drupal with the default theme in place on the demo site) if you have a long group description then the manage groups screen will require horizontal scrolling because the description won't wrap.

The same thing happens with the Activities tab if you have a long subject.

The only side effect of fixing this problem that I have found is that the in-place editable fields require scrolling when editing, since they don't wrap. However, this seems minor compared with the inconvenience of horizontal scrolling with viewing.