New locale for CHTI

Hello there, we would like to start a locale for “CHTI” (french slang from North of France) similar to what the pirate locale is. Like the pirate locale, there isn’t really much info but I have supplied what I know 🙂

Locale: fr_CHTI
Country code: fr
Plural forms: nplurals=2; plural=(n > 1); (same as french)
Language native name: Ch’ti
Language English name: Chti
Sub-domain: ?
Site Title: Ch’ti
Site Description: WordPress in ch’ti ichi !
Admin Username(s): @juliobox
Admin Email address: (REDACTED)

Am I right with “locale” and “country code
Thank you 🙂