[imp] minor readability fix in folders page

[Chuck Hagenbuch]

Quoting Liam Hoekenga <liamr at umich.edu>:

> That's how I did it on our test machine.  I also replaced the column
> headings with labels I thought were clearer, and swapped their order
> because I thought having the total message number after the new message
> number made more sense.

I've committed basically this to HEAD, with a few other changes. Take a look
and see what folks think...

-chuck

--
Charles Hagenbuch, <chuck at horde.org>
"... It is not more light we need, but more warmth! We die of cold, not of
darkness. It is not the night that kills, but the frost." - Miguel de
Unamuno