Cldr.Locale.put_gettext_locale_name

You're seeing just the function put_gettext_locale_name, go back to Cldr.Locale module for more information.
Link to this function

put_gettext_locale_name(language_tag, backend)

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Specs

put_gettext_locale_name(Cldr.LanguageTag.t(), Cldr.backend()) ::
  Cldr.LanguageTag.t()