Purpose

django-localize used to add language prefix to your URL without urls.py modifications.

Install

Put localize somewhere in your sys.path (PYTHONPATH)

Add localize to settings.INSTALLED_APPS in FIRST position, for example

INSTALLED_APPS = (
    'localize',
    'django.contrib.markup',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
)

Add 'localize.middleware.LocaleURLMiddleware' to settings.MIDDLEWARE_CLASSES,

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',   # SessionMiddleware should go first
    'localize.middleware.LocaleURLMiddleware'
    'django.middleware.common.CommonMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.middleware.http.ConditionalGetMiddleware',
)

settings.NON_I18N_URLS is list of exception urls, for example

NON_I18N_URLS = (
    MEDIA_URL,
    ADMIN_MEDIA_PREFIX,
    '/robots.txt',
)

Define your languages in settings.LANGUAGES (you may combine it with gettext)

LANGUAGES = (
    ('ru', 'Russian'),
    ('en', 'English'),
)

Set settings.USE_I18N

USE_I18N = True

Usage

Functions django.core.urlresolvers.reverse, django.db.models.permalink and template tag {% url %} now accept locale parameter.

Example

models.py

from django.db import models
from django.conf import settings

class SomeModel(models.Model):
    lang = models.CharField(max_length=2, db_index=True, choices=settings.LANGUAGES)
    title = models.CharField(max_length=255)
    text = models.TextField()

    def __unicode__(self):
        return u'%s (%s)' % (self.title, self.lang)

    @models.permalink
    def get_absolute_url(self):
        return ('somemodel_namedurl_view', (), {
            'id': self.pk,
            'locale': self.lang,
        })

And now you able to do next:

>>> from models import SomeModel
>>> s = SomeModel.objects.get(pk=1)
>>> s.get_absolute_url()
/en/some_path/123/