* Special:UserLogin/signup now does AJAX checks for invalid and taken usernames,
displaying the error live.
* Added BaseTemplateAfterPortlet hook to allow injecting html after portlets in skins.
+* Support has been added for a JSON based localisation file format. The
+ installer has been updated to use it.
=== Bug fixes in 1.23 ===
* (bug 41759) The "updated since last visit" markers (on history pages, recent