lang argument in quarto chapter yaml header is not taken into account

[lucasvoirin]

It seems that the lang argument in quarto chapter _metadata.yml or yaml header is not taken into account for pdf output. Only the lang argument in _quarto.yml is taken into account.

Here are the files used to reproduce this bug :

_quarto.yml

project:
  type: book
  
lang: fr

book:
  chapters:
    - index.qmd
    - fr.qmd
    - en.qmd

bibliography: references.bib

filters:
  - section-bibliographies

format:
  html:
    theme: cosmo
  pdf:
    documentclass: scrreprt
    citeproc: false

editor: visual

index.qmd

# Preface {.unnumbered}

en.qmd

---
lang: en
---

# English

[@ethier2020]

fr.qmd

---
lang: fr
---

# French

[@ethier2020]

references.bib

@article{ethier2020,
	title = {Using microphone arrays to investigate microhabitat selection by declining breeding birds},
	author = {Ethier, Jeffrey P. and Wilson, David R.},
	year = {2020},
	month = {07},
	date = {2020-07-01},
	journal = {Ibis},
	pages = {873--884},
	volume = {162},
	number = {3},
	doi = {10.1111/ibi.12785},
	note = {DOI: 10.1111/ibi.12785
MAG ID: 2977097847}
}

The outputs of these files running quarto render index.qmd are a html website with correct citation, i.e. "and" between authors names for english chapter and "et" between authors names for french chapter, and a pdf file with only french formated citations (as lang: fr is specified in _quarto.yml).