The language name in English…

The language name in English in “Panjabi”, not Punjabi. for this locale
Here you can see the ISO 693-3 name is “Panjabi”.
SO please change the English name of 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 pa_IN from “Punjabi” to “Panjabi”.