Please Add Maithili (मैथिली) Language.

Maithili is also an official language of India. Approx 100 million people speak Maithili in India and Nepal. Wikipedia is also avlaibe in Maithili.
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 The ISO 639-3ISO 639-3 ISO 639-3 code is an international standard for language codes in the ISO 639 series. It defines three‐letter codes for identifying languages. : mai
Country code: IN
Language native name: मैथिली
Language English name: Maithili
Sub-domain: IN_mai
Site Title: Mithila Live
Site Description: this website is for Maithili Speaking people