Updating the settings.py template for new installations.

fix #355

modoboa/core/templates/settings.py

@@ -104,6 +104,7 @@ MIDDLEWARE_CLASSES = (
     # 'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.locale.LocaleMiddleware',
     # Uncomment the next line for simple clickjacking protection:
     # 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 
@@ -156,7 +157,6 @@ INSTALLED_APPS = (
 
 AUTHENTICATION_BACKENDS = (
     'modoboa.lib.authbackends.SimpleBackend',
-    'django.contrib.auth.backends.ModelBackend',
 )
 
 # A sample logging configuration. The only tangible logging