If we're collecting fix suggestions for slack-desc files, I noticed a few minor things:
pan:
> pan: This is PAN, a powerful and user-friendly USENET newsreader based on
> pan: GTK+2. Pan is the only Unix newsreader to score 100% on the Good
I believe Pan now builds for GTK+3, so the desc shouldn't really specify a GTK version. Maybe either remove the "2", or grab the appropriate-looking three-line description from the top of their website.
mozilla-thunderbird: URL is now
https://www.thunderbird.net/