UI of Sitecore CMS os available in how many languages to editors?

while working in sitecore, the UI of it is available in how many languages. For example, the translated string of 'OK' 'Cancel', 'Error' etc kind of messages are present by default, or we need to install separately?

Solution

The UI is available in English, Danish, German, and Japanese (4), based on the the client translation packs listed on the Sitecore 8.1 download page.

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