Configures the languages that can be used as the preferred languages by Google Chrome OS.
If this policy is set, the user can only add one of the languages listed in this policy to the list of preferred languages. If this policy is not set or set to an empty list, user can specify any languages as preferred. If this policy is set to a list with invalid values, all invalid values will be ignored. If a user previously added some languages that are not allowed by this policy to the list of preferred languages they will be removed. If the user had previously configured Google Chrome OS to be displayed in one of the languages not allowed by this policy, the display language will be switched to an allowed UI language next time user signs in. Otherwise, Google Chrome OS will switch to the first valid value specified by this policy, or to a fallback locale (currently en-US), if this policy only contains invalid entries.