iso639ToLangCode

An helper function that converts an ISO 639-1 (2-letter) language code to the corresponding LanguageCode value. * note: If a str does not represent a valid (2-letter) language code, the function returns the LanguageCode.DEFAULT_LANGUAGE value. note: You can use the special "IC" (or "ic") language code if you want to get/search a country by its ISO 3166 Alpha 3-country code.

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