$revision: New Revision of the article
'PageContentLanguage': Allows changing the language in which the content of a
-page is written. Defaults to the wiki content language ($wgContLang).
+page is written. Defaults to the wiki content language.
$title: Title object
-&$pageLang: the page content language (either an object or a language code)
-$wgLang: the user language
+&$pageLang: the page content language. Input can be anything (under control of
+ hook subscribers), but hooks should return Language objects. Language code
+ strings are deprecated.
+$userLang: the user language (Language or StubUserLang object)
'PageContentSave': Before an article is saved.
$wikiPage: the WikiPage (object) being saved