$key: the section name
&$legend: the legend text. Defaults to wfMessage( "prefs-$key" )->text() but may be overridden
+'PreferencesFormPreSave': Override preferences being saved
+ $formData: array of user submitted data
+ $form: PreferencesForm object, also a ContextSource
+ $user: User object with preferences to be saved set
+ &$result: boolean indicating success
+
'PrefixSearchBackend': Override the title prefix search used for OpenSearch and
AJAX search suggestions. Put results into &$results outparam and return false.
$ns : array of int namespace keys to search in
$sktemplate: SkinTemplate object
$nav_urls: array of tabs
+'SkinTemplateGetLanguageLink': After building the data for a language link from
+which the actual html is constructed.
+&$languageLink: array containing data about the link. The following keys can be
+ modified: href, text, title, class, lang, hreflang. Each of them is a string.
+$languageLinkTitle: Title object belonging to the external language link
+$title: Title object of the page the link belongs to
+
To alter the structured navigation links in SkinTemplates, there are three
hooks called in different spots: