Make more clear board calling time

I've put time in CEST format (16:00) plus 2 lines explaining the dst changes in utc 
On Monday 15 December 2014 07.21:17 Vincent Untz wrote:
> > @@ -4,8 +4,9 @@ Subject: [reminder] Board Conf Call tomorrow at %(hour)s:%(minute)s UTC
> >  
> >  Hello all,
> >  
> > -The biweekly board conf call will be held tomorrow at %(hour)s:%(minute)s UTC
> > -with the usual conf call system.
> > +The biweekly board conf call will be held tomorrow at %(hour)s:%(minute)s CEST 
> > +(Nuremberg / Geeko Meridian time) with the usual conf call system.
> > +This mean %(hour)-2 UTC during summer time and %(hour)-1 UTC during winter time.
> 
> Sorry, didn't notice it earlier, but you want `%(hour)s` not `%(hour)` (which won't work). Also, feel free to merge all the commits in this file in one commit.
> 
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/openSUSE/mail-reminder/pull/2/files#r21831077
okay will redo it global
-- 

Bruno Friedmann 
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