Make sure additional information for accessibility is always exposed to screen readers

In the list of forums or the list of topics for a forum, the numbers representing the number of topics and the numbers of posts, or the numbers of views and replies respectively, have in the source code additional information within an "dfn" tag. However, in the content.css file of the prosilver theme, this information is being hidden by being styled "display: none;". This causes this information never to be exposed to screen readers for the blind, making it impossible to associate the numbers to their respective units. A brief discussion of the problem leading to the creation of this ticket can be found here:
http://www.phpbb.com/community/viewtopic.php?f=64&t=1291065&p=9351915#p9351915

Attached is a patch for the prosilver content.css file to position the info absolutely in an off-screen area rather than not displaying it. Screen readers now read the numbers, but from the visual representation my screen reader gave me, they still don't appear.

But this should definitely be checked visually to make sure layout isn't impaired.