Choosen language missing in downloaded json report

[julezrulez]

Describe the bug
If you choose for a non-English language of reporting and you finish and save the report-file in json format the property of language is always "en".

To Reproduce
Steps to reproduce the behavior:

1. Go to https://www.w3.org/WAI/eval/report-tool/evaluation/view-report
2. Click 'Nederlands' in top of the page (at "This page in:")
3. Save the json file (Ctrl+S)
4. Open the saved json file
5. find the properties of language

Expected behavior
In the json file: "language":"nl"

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Chrome
• Version 126 / Dutch

Smartphone (please complete the following information):
n/a

Additional context
The saved HTML report contains the right language: html lang="nl"