Codex tools: Log in
Although WordPress displays in U.S. English (en_US) by default, the software has the built-in capability to be used in any language. The WordPress community has already translated WordPress into many languages, and there are themes, translation files and support available in many other languages. It is also possible to create a multilingual blog with the help of Plugins.
If you want to use WordPress in another language, you can do the following:
The list of localizations that was previously here was out of date and has been removed. The list will live here soon and a link to a current, updated list is on that page.