Since October 2007, every team translating WordPress can have their own local web site at a xx.wordpress.org subdomain.
The site is a WordPress install, which has four aims:
These are accompanied by a blog, letting users follow the news about the translations.
To request a new local site please read the Requesting a New Locale page on the Translator Handbook.
You can also read about how to start your language's support forum site on WordPress.org.