Breton vs Breton language

Breton

name
  • A village in Alberta, Canada. 

noun
  • A person from Brittany. 

  • The Celtic language of Brittany. 

adj
  • Of or pertaining to Brittany. 

Breton language

How often have the words Breton and Breton language occurred in a corpus of books? (source: Google Ngram Viewer )