the system message 'emailsender' should be modified (default: "{{SITENAME}}").
* $wgDBAhandler was removed as the only class using it was also removed
* The 'max threads' setting was removed from $wgDBservers.
+* Support for AdminSettings.php has been completely removed. All configuration
+ belongs in LocalSettings.php.
=== New features in 1.23 ===
* ResourceLoader can utilize the Web Storage API to cache modules client-side.