For proper LOCALE settings how can we get…

For proper LOCALELocale Locale = language version, often a combination of a language code and a region code, for instance es_MX denotes Spanish as it’s used in Mexico. A list of all locales supported by WordPress in https://make.wordpress.org/polyglots/teams/ settings, how can we get an official translation for English (South Africa) added under en_ZA. Basically we use British English, so you can just copy the en_GB as a starting point. I have added custom language files in my wp-content/languages folder, but these don’t show up in the GENERAL|SETTINGS as “English (South Africa)” because this mapping is missing (I don’t know where it’s coded), as it’s not in the language file either.

#request