Lex WEB UI with Kendra : is it possible to ask questions in French ?

Hi I have a Kendra index with a data source (WEB Crawling) sets to be in French. I used AWS QnA bot with Kendra enable. The Lex WEB UI is my UI.

The problem is that Kendra is setup by default in English. I cannot find where (in the Lex WEB UI) to tell that I need Kendra to search in French and not in English.

Any suggestions ???