Ensure all news pages have a date manually specified

This helps to get a correct order for news pages when the wiki is built away
from Git.

wiki/src/news/new_SSL_certificate.mdwn

+[[!meta date="2012-01-06 22:01:54 +0100"]]
 [[!meta title="New SSL certificate for tails.boum.org"]]
 [[!tag announce]]
 

wiki/src/news/report_2011_01-02.mdwn

+[[!meta date="2011-03-02 00:46:14 +0100"]]
 [[!meta title="Bimonthly report: January and February 2011"]]
 [[!tag announce]]
 

wiki/src/news/report_2011_03-04.mdwn

+[[!meta date="2011-05-09 19:23:22 +0200"]]
 [[!meta title="Bimonthly report: March and April 2011"]]
 [[!tag announce]]
 

wiki/src/news/report_2011_05-06.mdwn

+[[!meta date="2011-07-05 17:04:54 +0200"]]
 [[!meta title="Bimonthly report: May and June 2011"]]
 [[!tag announce]]
 

wiki/src/news/report_2012_01-04.mdwn

+[[!meta date="2012-05-01 15:24:33 +0200"]]
 [[!meta title="Report: January to April 2012"]]
 [[!tag announce]]