Update changelog.

CHANGELOG

@@ -1,3 +1,10 @@
+0.5.0 - 20130525
+  * Upgrade COPS UI to HTML5 / CSS3 to hopefully make it prettier. Most code was contributed by Thomas Severinsen.
+  * Add the number of books in each databases (when multiple database is enabled).
+  * Add Norwegian Bokmål strings. Thanks to Rune Mathisen for the pull request.
+  * Add a split by language of catalog. Thanks to Puiu Ionut for the pull request.
+  * Theming ////
+
 0.4.0 - 20130507
   * Add multiple database support. Check the documentation of $config['calibre_directory'] in config-default.php to see how to enable it.
   * Include jquery library in COPS's repository to be sure that COPS will work on LAN (without Internet access).