Flask-humanize does not set default_locale

[ppfranco]

It seems in app_has_babel() a app.extensions.get("babel").default_locale is more appropriate than app.config['BABEL_DEFAULT_LOCALE']? Underscore format it_IT instead of bare "it" currently returned by Babel seems to need a design shift.

I'm using this in main.py application factory but it still not works:

@humanize.localeselector
def get_locale():
    locale = current_app.extensions.get("babel").default_locale
    return f"{locale.lower()}_{locale.upper()}"

This also do not sound:

    @property
    def default_locale(self):
        """Returns the default locale for current application."""
        return current_app.config['HUMANIZE_DEFAULT_LOCALE']

app.extensions.get("humanize").default_locale
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File ".venv/lib/python3.11/site-packages/flask_humanize/__init__.py", line 105, in default_locale
    return current_app.config['HUMANIZE_DEFAULT_LOCALE']
           ^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/werkzeug/local.py", line 318, in __get__
    obj = instance._get_current_object()
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.11/site-packages/werkzeug/local.py", line 519, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed
the current application. To solve this, set up an application context
with app.app_context(). See the documentation for more information.