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Returns the string representation of this Locale. It consists of the language code, country code and variant separated by underscores. If the language is missing the string begins with an underscore. If the country is missing there are 2 underscores between the language and the variant. The variant cannot stand alone without a language and/or country code: in this case this method would return the empty string.
Examples: "en", "en_US", "_US", "en__POSIX", "en_US_POSIX"