Qt for webassembly doesn't use browser's locale for its QLocale::system()

According to here:

https://stackoverflow.com/a/31135571

Browser's locale can be determined with navigator.languages api which will return an array of user's locales (from the most preferred to the least preferred).

I have attached a small project that reproduces this issue.

You may need to change your browser's locale for this to work, for instance in firefox I add the user language "Portuguese-Portugal" and then I move it to top to get it as the preferred locale afaik. navigator.languages then return pt-PT as the first element.