This is the only official project for text translation for http://www.khanacademy.org, and covers exercises, articles, and user-interface text.

Note: In order to volunteer to help with this translation project you will need to apply through our Khan Academy website—for more information please visit: https://support.khanacademy.org/hc/articles/226412368-How-can-I-apply-to-be-a-translator-for-Khan-Academy-. If you are accepted by your language advocate, they will share information on what/how to translate. For more information please contact your language advocate: https://support.khanacademy.org/hc/en-us/articles/226322087-Contact-Language-Advocates.
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