+'SpecialRandomGetRandomTitle': called during the execution of Special:Random,
+use this to change some selection criteria or substitute a different title
+&$randstr: The random number from wfRandom()
+&$isRedir: Boolean, whether to select a redirect or non-redirect
+&$namespaces: An array of namespace indexes to get the title from
+&$extra: An array of extra SQL statements
+&$title: If the hook returns false, a Title object to use instead of the
+result from the normal query
+