0.25.1 Adding support for system localization settings.

[tct123]

Adding support for system localization settings.

[CLAassistant]

All committers have signed the CLA.

[ndonkoHenri]

How do you plan to make use of that variable?

[tct123]

Import flet as ft

def main(page: ft.Page):
    mylocale = page.defaultlocale()
    page.add(ft.Text(f"Current locale is �{mylocale}"))

ft.app(main)

[ndonkoHenri]

This is not how to do it.
We will propertly implement it in flet-dev/flet#3010

Please be patient.