Create an override for 'globalblocking-ipblocked-range' for Wikimedia
Creates a Wikimedia override for the 'globalblocking-ipblocked-range
message from the GlobalBlocking extension which is called
'wikimedia-globalblocking-ipblocked-range', similarly to what we've done
for other GlobalBlocking messages so Wikimedia users affected by global
IP blocks knows where to request more information or appeal them.
Documentation was tweaked a bit on includes/WikimediaMessagesHooks.php
so it's clear we're talking about global blocks, just in case.