Localization through the update site:
Start Eclipse, go to . Click Add Site in the Available Software tab of the Software Updates dialog box. Enter https://www.oxygenxml.com/InstData/Author/Eclipse/site.xml in the location field of the Add Site dialog box. Click OK. Select the language pack checkbox.
Localization through the zip archive:
Go to https://www.oxygenxml.com/download.html and download the zip archive with the plugin language pack. Unzip the downloaded zip archive in the dropins subdirectory of the Eclipse install directory. Restart Eclipse.
If your operating system is running in the language you want to start Eclipse in (for
example, you are using Japanese version of Windows, and you want to start Eclipse in
Japanese), Oxygen XML Author Eclipse plugin matches the appropriate language from the language pack.
However, if your operating system is running in a language other than the one you want to
start Eclipse in (for example, you are using the English version of Windows, and you want to
start Eclipse in Japanese, if you have the required operating system language support
including the keyboard layouts and input method editors installed), specify the -nl
<locale> command-line argument when you launch Eclipse. Oxygen XML Author Eclipse plugin
uses the translation file that matches the specified <locale>.
You can also localize the Eclipse plugin to a different language than the initial languages in the language pack. Duplicate the plugin.properties file from the Oxygen XML Author Eclipse plugin plugin installation directory, translate all the keys in the file and change its name to plugin_<locale>.properties.