Follow-up r 86041 per CR and IRC:

Follow-up r 86041 per CR and IRC:
* Article constructor needs to be called with zero as second parameter
* Run stylize.php over new files
* Add Action::getLang() for consistency with other context accessors
* Fix declaration of FormAction::alterForm(), doesn't need to be passed by reference
* Fix inline use of Credits::getCredits() in SkinTemplate and SkinLegacy