French translation is not available on Windows/Stand alone version

[PierreRaybaut]

It appears the the locale is not properly detected on Windows, so that the application is not translated for example on a french locale Windows install.

The workaround is simple:

• Add an environment variable named "LANG" and set it to "fr"
• Or in a batch script or from the command line: set LANG=fr

[PierreRaybaut]

This is apparently related to pyinstaller (V6.1.0 or 6.2.0) which is not packaging properly locale-related modules: import locale; print(locale.getlocale()) will return (None, None) instead of the real locale infos.