Bug 14272: (follow-up) Fixing layout issues and expiration date hint

Bug 14272: (follow-up) Fixing layout issues and expiration date hint

Misunderstood the first time.

I've added the hint to the news form on staff side.
I've fixed the layout on OPAC.
The RSS feed shows on the main page, but is hidden if there is no news
and if viewing one news item.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>