Possible bug in stats page dark mode

[Shawn Heisey]

On the dark mode stats page served by version 2.6-dev5, the frontend or 
backend description is grey text on a white background.  It's very hard 
to read.

This problem can't be seen on stats.haproxy.org, possibly because the 
frontend and backend configs do not have any descriptions.

Thanks,
Shawn