How to fork LocaleMiddleware? I need to make a small change.

[Oleg Barbos]

When LocaleMiddleware sees the request coming in, it tries to parse the language from the request. See https://github.com/django/django/blob/92507bf3ea4dc467f68edf81a686548fac7ff0e9/django/utils/translation/trans_real.py#L46 for the regular expression used. The allowed format is: any sequence of word characters, and optionally a dash and more word characters, after that it expects either the end of the string, or a /. In my case, it matches id-button/, and understands that id-button is the language prefix for that request, causing Django to activate the id language.

I need to change this behaviour, so it would check if second part like "button" is in a whitelist of languages from SETTINGS.

so the languages "id", "de", "zh-Hans" should work properly, but when slug is "id-button/" - it should get English language.

[Aldian Fazrihady]

You can just extend LocaleMiddleware like this:
```
class MyLocaleMiddleware(LocaleMiddleware):

    def process_request(self, request):
        super().process_request(request)

        # TODO: add my custom code
```
Save it to a python file, such as `middleware.py`

On the django settings file, replace the LocaleMiddleware with yours:
```
MIDDLEWARE = [
    '<my app folder>.<my middleware python file base name>.MyLocaleMiddleware',
]
```

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Regards,

Aldian Fazrihady
http://aldianfazrihady.com