Django i18n setlang not changing session data django_language

Question

I don't know what I'm doing wrong, but my session data won't change even if I submit a new language to /i18n/setlang. I am to translate to Filipino language using the code 'tl' but somehow, it just doesn't seem to work. Please help. Here are some code:

# Django settings for ppdjango project.
import os

DEBUG = True
TEMPLATE_DEBUG = DEBUG

ADMINS = (
    # ('Your Name', '[email protected]'),
)

MANAGERS = ADMINS

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3', 
        'NAME': 'bookmarksdb',                      
        'USER': '',                      # Not used with sqlite3.
        'PASSWORD': '',                  # Not used with sqlite3.
        'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '',                      # Set to empty string for default. Not used with sqlite3.
    }
}

# Local time zone for this installation. Choices can be found here:
# http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# On Unix systems, a value of None will cause Django to use the same
# timezone as the operating system.
# If running in a Windows environment this must be set to the same as your
# system time zone.
TIME_ZONE = 'America/Chicago'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
# LANGUAGE_CODE = 'en-us'
LANGUAGE_CODE = 'en-us'

LANGUAGES = (
    ('tl', 'Filipino'),
    ('en', 'English'),
)

SITE_ID = 1

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale
USE_L10N = True

# Absolute path to the directory that holds media.
# Example: "/home/media/media.lawrence.com/"
MEDIA_ROOT = ''

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
# trailing slash if there is a path component (optional in other cases).
# Examples: "http://media.lawrence.com", "http://example.com/media/"
MEDIA_URL = ''

# URL prefix for admin media -- CSS, JavaScript and images. Make sure to use a
# trailing slash.
# Examples: "http://foo.com/media/", "/media/".
ADMIN_MEDIA_PREFIX = '/media/'

# Make this unique, and don't share it with anybody.
SECRET_KEY = '35qqpsggj&v0^!rdabnr7daj(#gu2252hj4&8qw1k6gb@5r)qa'

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
#     'django.template.loaders.eggs.Loader',
)

MIDDLEWARE_CLASSES = (
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware'
)

ROOT_URLCONF = 'ppdjango.urls'

TEMPLATE_DIRS = (
    # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    os.path.join(os.path.dirname(__file__), 'templates')
)

TEMPLATE_CONTEXT_PROCESSORS = (
    "django.core.context_processors.auth", 
    "django.core.context_processors.debug", 
    "django.core.context_processors.i18n", 
    "django.core.context_processors.media", 
    'django.core.context_processors.request',
)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.comments',
    'bookmarks',

    # Uncomment the next line to enable the admin:
    'django.contrib.admin',
    # Uncomment the next line to enable admin documentation:
    # 'django.contrib.admindocs',
)

LOGIN_URL = '/login/'
CACHE_BACKEND = 'db://cache_table'
CACHE_MIDDLEWARE_SECONDS = 60 * 5

#email
SITE_HOST = '127.0.0.1:8000'
DEFAULT_FROM_EMAIL = 'Django Bookmarks <[email protected]>'
EMAIL_HOST = 'mail.ygamretuta.com'
EMAIL_PORT = ''
EMAIL_HOST_USER = '[email protected]'
EMAIL_HOST_PASSWORD = ''

My language settings form: {

{% load i18n %}

<!DOCTYPE html>
<html>
  <head>
    <title>
    Django Bookmarks | {% block title %}{% endblock %}
    </title>
    <link rel="stylesheet" type="text/css" href="/site_media/style.css">
    <script type="text/javascript" src="/site_media/jquery.js"></script>
    {% block external %}
      <script type="text/javascript" src="/site_media/search.js"></script>
    {% endblock %}
  </head>

  <body>
  {% block content %}{% endblock %}

    <div id="footer">
      <form action="/i18n/setlang/" method="post">
        {% csrf_token %}
        <input name="next" type="hidden" value="/friend/invite/" />
        <select name="language"> 
          {% for lang in LANGUAGES %}
            <option value="{{ lang.0 }}">{{ lang.1 }}</option>
          {% endfor %}
        </select>
        <input type="submit" value="Switch Language"/>
      </form>
    </div>
  </body>
</html>

my url settings:

# the rest is above
(r'^i18n/', include('django.conf.urls.i18n')),

EDIT My languages are working well because if I make 'tl' the only language in settings, the page get translated to Tagalog

EDIT included the whole settings file

Answer 1

MIDDLEWARE_CLASSES = (
    'django.middleware.cache.UpdateCacheMiddleware',
+    'django.middleware.locale.LocaleMiddleware', # you need this to activate language (code)
    'django.middleware.common.CommonMiddleware',
    ...
)