Add a translation key for the blog

Could you add this key (xe.blog.categories.noentries)  here:
http://l10n.xwiki.org/xwiki/bin/inline/Platform/PlatformXWikiCoreResources
plz?
Or show me the way to do it.
Add a translation key for the blog
Merge pull request #291 from Pbast/patch-7

XWIKI-10587 - Add a translation key for the blog