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Configures the locale which is enforced on the Google ChromeOS sign-in screen.
If this policy is set, the sign-in screen will always be displayed in the locale which is given by the first value of this policy (the policy is defined as a list for forward compatibility). If this policy is not set or is set to an empty list, the sign-in screen will be displayed in the locale of the last user session. If this policy is set to a value which is not a valid locale, the sign-in screen will be displayed in a fallback locale (currently, en-US).