Cannot use other locales even though changing `LC_TIME`

Hi,

Thank you for this incredible package that will change so many things in the R ecosystem 🤩.

I have a shinylive app running on httpuv::runStaticServer() (and soon on GHpages), which works as intended.

However, the app has a UI in French when run from RStudio, but in English when run from the httpuv server.
Despite my many efforts, I was not able to switch the latter to French.

As a (hopefully) reproducible example, you can add the following code anywhere in the minimal example of shinylive.
I put the output read in the JS console as comments.
Note that I'm running RStudio desktop on Windows 10 on a French computer.

library(lubridate)
print(Sys.getlocale("LC_ALL"))  #"fr_FR.UTF-8"
wday(today(), label=TRUE) |> print()  #Friday
wday(today(), label=TRUE), locale="French" |> print() #Friday

Sys.setlocale("LC_ALL", locale="French_France.1252")
print(Sys.getlocale("LC_ALL")) #"French_France.1252"
wday(today(), label=TRUE) |> print() #Friday

"French_France.1252" is the output of Sys.getlocale("LC_ALL") when run locally in the R console. Of note, "fr_FR.UTF-8" is not recognized as a correct locale in the R console.

Additionally, the different dateInputs are in English, regardless of Sys.setlocale and of Sys.setenv(LANGUAGE="fr").
I get some JS warning from bootstrap (bootstrap-datepicker.min.js:1) that might be related:

DEPRECATED: This filename doesn't follow the convention, use bootstrap-datepicker.en-CA.js instead.
DEPRECATED: The language code "kh" is deprecated and will be removed in 2.0. For Khmer support use "km" instead.
DEPRECATED: The language code "kr" is deprecated and will be removed in 2.0. For korean support use "ko" instead.
DEPRECATED: This language code "rs-latin" is deprecated (invalid serbian language code) and will be removed in 2.0. For Serbian latin support use "sr-latin" instead.
DEPRECATED: This language code "rs" is deprecated (invalid serbian language code) and will be removed in 2.0. For Serbian support use "sr" instead.

I don't get notable errors, except the following, which are already described in other issues and don't seem to cause any trouble

shinylive.js:34938 preload error:wasm streaming compile failed: TypeError: Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.
shinylive.js:34938 preload error:falling back to ArrayBuffer instantiation
preload error:Warning in install(dep, repos, info, lib, quiet, mount) :
preload error:  Requested package curl not found in webR binary repo.

Start with the minimal shinylive app served by httpuv::runStaticServer() and reproduce the locale difference using lubridate::wday() and the dateInput controls. Inspect the browser console and the bootstrap-datepicker warnings while comparing the RStudio and browser behavior. Done means the French locale is honored in the browser output and date inputs, or the remaining limitation is documented.