Question

expand the theme: the treasure of regional languages
(about all languages)​

Answer 1

Answer:

A regional language is a language spoken in an area of a sovereign state, whether it be a small area, a federated state or province or some wider area.

Internationally, for the purposes of the European Charter for Regional or Minority Languages, "regional or minority languages" means languages that are:

traditionally used within a given territory of a State by nationals of that State who form a group numerically smaller than the rest of the State's population and

different from the official language(s) of that State[1]

Recognition of regional or minority languages must not be confused with recognition as an official language.