fixed dates (2015 added) and time of adding of the news

Signed-off-by: Remi Schnekenburger <remi.schnekenburger@cea.fr>
399853: [Widgets] Papyrus shall enable to edit the comment body with a
rich-text editor
https://bugs.eclipse.org/bugs/show_bug.cgi?id=399853
Merge branch 'master' of ssh://ptessier@git.eclipse.org/gitroot/www.eclipse.org/papyrus.git
399853: [Widgets] Papyrus shall enable to edit the comment body with a
rich-text editor
https://bugs.eclipse.org/bugs/show_bug.cgi?id=399853
399853: [Widgets] Papyrus shall enable to edit the comment body with a
rich-text editor
https://bugs.eclipse.org/bugs/show_bug.cgi?id=399853