Bug 68841 aliases for specialpages

These commits address https://wikia.fogbugz.com/default.asp?68841 . They contain a number of localized aliases for various special pages. A few .alias.php files as well as the code in setup files to load them has been added.

I would appreciate if anyone could take a look and merge if everything is ok or close the request if not. I'm particularity interested in whether or not the setup files' code used to load the alias.php files is properly written, as the syntax for it seems to vary from extension to extension. Thanks in advance :)