Twitter announced today that it has launched in Swedish. The microblogging service or social network – whatever you want to call it – is now available in 21 languages.

Twitter says over 400,000 volunteers have contributed to its translation center. This was launched last February as a means of crowdsourcing translations from Twitter users. Twitter has actually been crowdsourcing translations since 2009, but the center introduced a new system for doing so, relying on feedback from translators to make it better.

Other recently launched languages include: Danish, Finnish, Norwegian and Polish. You can see the entire list here:

“As the number of volunteer translators grows, we’ll explore new ways to empower users to translate and localize Twitter for even more communities,” Twitter says in a blog post. “Expect to see further improvements to the Translation Center in the coming year, including new translation tools and more opportunities to help make Twitter accessible to every person on the planet.”

Twitter has an official Translator account that you can follow to keep abreast of further updates regarding the center and Twitter translation in general.