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When logged-in in the AdminCentral, users may set their language locale parameter via the Language field in the Edit user profile dialog. The setting will be reflected in the names of action menus, actions, buttons and labels throughout the AdminCentral provided the locale is one of the available system languages or it will fallback to English, the default fallback language but configurable. 

To set it, open the pull down menu in the top right corner of the browser window and click the first row of the menu, titled Edit user profile if the current locale setting is English. On the Preferences tab:

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