Simplify the following text for a Grade 10 native English-speaking person.
Original: The European Charter for Regional or Minority Languages ( ECRML ) is a European treaty ( CETS 148 ) adopted in 1992 under the auspices of the Council of Europe to protect and promote historical regional and minority languages in Europe .
Simplified: It was designed by the Council of Europe to protect and promote historical regional and minority languages in Europe .