Yes. The Zimbra Web client and administration console are available in Arabic, Chinese (simplified and traditional), Danish, Dutch, English (United Kingdom, Australia, United States), French, German, Hindi, Italian, Japanese, Korean, Polish, Brazilian Portuguese, Russian, Spanish, Swedish and Turkish.
The Zimbra Web client online help is available in English, German, Spanish, French, Japanese, Dutch, Italian, Brazilian Portuguese, Russian, Chinese and Hong Kong Chinese.
The Zimbra administration console online help is available in English.
Refer to the Zimbra Collaboration Server 8 System Requirements Guide for a complete list of the supported languages for each product component.