I followed instructions from documentation, but it didn't work:
```_quarto.yml
project:
  type: book

book:
  title: "My book title"
  language: "pt-BR"
  chapters:
    - index.qmd
format:
  html:
    theme: cosmo
````

_Originally posted by @fredguth in https://github.com/quarto-dev/quarto-cli/discussions/2453#discussioncomment-3779914_
    
dragonstyle
2022-10-03T08:27:53Z
cderv
documentation
v1.3
closed
changing language of a book does work with `language` key
https://github.com/quarto-dev/quarto-cli/issues/2707