Khan Academy has been translated into other languages. You can see the full list of languages and how much has been translated here.
In the footer (at the bottom) of the Khan Academy site, you can select the language of your choice.
You can also choose a language other than English as your default language when using Khan Academy (instructions here.)
There are also subtitle translations available for many of our English videos. See this article for more information on how to enable subtitles on Khan Academy videos.
The translated content is largely made possible by our wonderful volunteer community who helps us in continuing to make the content available in other languages. To join the translation effort, please visit www.khanacademy.org/contribute.
This effort is largely volunteer driven, with some language teams receiving support from local foundations and sponsor organizations. We are always looking for additional organizations and individuals who would like to make Khan Academy more widely available.