mermaid gantt diagram ignores language setting

Bug description

When I setup a quarto document to use danish, and embed a mermaid gantt diagram, the html rendition of the gantt diagram contains dates in english.

Steps to reproduce

---
date: 2023-10-01
date-format: "D. MMM."
lang: da
---
```{mermaid}
gantt
  excludes weekends
  tickInterval 1month
  axisFormat %e. %b.

  section All
  Event: 2023-09-01, 2m
  Event: 2023-10-01, 2m
```

Expected behavior

Lower right corner of rendered gantt diagram should say "1. okt."

Actual behavior

Lower right corner of rendered gantt diagram should say "1. Oct."

I.e. capitalized and with "c" instead of "k" as in danish "oktober".

Your environment

• IDE: none
• OS: Linux

Quarto check output

$ quarto check
Quarto 1.4.376
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.8: OK
      Dart Sass version 1.55.0: OK
      Deno version 1.33.4: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.4.376
      Path: /opt/quarto/bin

[✓] Checking tools....................OK
      Chromium: 869685
      TinyTeX: (not installed)

[✓] Checking LaTeX....................OK
      Using: Installation From Path
      Path: /usr/bin
      Version: 2023

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.11.5
      Path: /usr/bin/python3
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/