Django LocaleByDomainMiddleware - Locale By Domain Middleware

middleware.py

from django.conf import settings
from django.utils import translation


class LocaleByDomainMiddleware():
    def process_request(self, request):
        host = request.META['HTTP_HOST'].lower()
        locales = dict(settings.LOCALE_DOMAINS)

        if not host in locales:
            language_code = settings.LANGUAGE_CODE
        else:
            language_code = locales[host]

        request.LANGUAGE_CODE = language_code
        translation.activate(language_code)

    def process_response(self, request, response):
        response['Content-Language'] = translation.get_language()
        translation.deactivate()
        return response

settings.py

LOCALE_DOMAINS = (
    ('www.mysite.com', 'en'),
    ('mysite.com', 'en'),
    ('ru.mysite.com', 'ru'),
    ('de.mysite.com', 'de'),
    ('fr.mysite.com', 'fr'),
)

Hello!
Your code is very useful, but I have situation when I want change locale by buttons and regarding domain.
And I haven't ideas how to do this.
Maybe you can help?