language_list - Specifies the names of one or more languages in a space-delimited list. Use the language name format "language-REGION" ...

language_list - Specifies the names of one or more languages in a space-delimited list. Use the language name format "language-REGION" for each language specified, where language is the lowercase ISO 639 language code and REGION is the uppercase ISO 3166-1 country/region identifier, e.g., en-US, fr-FR, en-GB, zh-CN.