'GetPreferences': Modify user preferences.
$user: User whose preferences are being modified.
&$preferences: Preferences description array, to be fed to an HTMLForm object
-$context: IContextSource object (added in 1.33)
'GetRelativeTimestamp': Pre-emptively override the relative timestamp generated
by MWTimestamp::getRelativeTimestamp(). Return false in this hook to use the
$old: old title
$nt: new title
$user: user who does the move
+$reason: string of the reason provided by the user
+&$status: Status object. To abort the move, add a fatal error to this object
+ (i.e. call $status->fatal()).
'TitleMoveStarting': Before moving an article (title), but just after the atomic
DB section starts.