Translations:MediaWiki 1.27/14/en

Breaking changes

 * MediaWiki now requires at least PHP 5.5.9. This corresponds with HHVM 3.1.
 * The RandomRootPage extension has been merged into MediaWiki core. If you have it installed, you should uninstall it.
 * The ApiSandbox extension has been merged into MediaWiki core. If you have it installed, you should uninstall it.