Oxygen comes with a user interface available in English, French, German, Japanese, Dutch, and Italian. If you want to use Oxygen in other language you have to translate all the messages and labels available in the user interface (menu action names, button names, check box texts, view titles, error messages, status bar messages, etc.) and provide a text file with all the translated messages in the form of a Java properties file. Such a file contains message key - translated message pairs displayed in the user interface. To install the new set of translated messages, copy this file into the [Oxygen-install-folder]/lib folder, restart Oxygen and set the new language in the Oxygen preferences. You can get the keys of all the messages that must be translated from the properties file containing the English translation. To get this file, contact us at support@oxygenxml.com.