Every new locale request should consist of the following information. This information should be provided by the person requesting the locale as explained in the handbook page “Requesting a new locale”
Locale: The ISO 639-3 locale code that is specific for your language
Country code: The specific code for your country (ex: es for Spain or mx for Mexico)
Plural forms: Thenumber of plural forms and the rules for those(ex: nplurals=2, (n>1) for Artipan)
Language native name: The name of the language in the language (Ex: Български for Bulgarian)
Sub-domain: The subdomain of your site will use the ISO 639-3 language code, so that’s what you will need to provide. Exceptions are locales for location specific languages, where the subdomain uses the two letter ISO 639-2 code followed by the country code (Ex. es_mx for Mexican Spanish).
Site Title: The title for your site should be the “Country or language name.”
Site Description: A tagline or description of your site in your native language
Admin Username(s): The wordpress.org usernames of the admins for your site.
Admin Email address: The wordpress.org email address of at least one of the administrators