title: Django cannot find url pattern in URLConf although it is defined
body: <p>I type the following url in my browser:</p>
  
  <p><a href="http://localhost:8000/en/weblog/2010/aug/10/wie-baue-ich-ein-weblog/" rel="nofollow noreferrer">http://localhost:8000/en/weblog/2010/aug/10/wie-baue-ich-ein-weblog/</a></p>
  
  <p>an I get a "Page Not Found (404)" error, although the 10th entry </p>
  
  <pre><code>(r'^weblog/(?P&lt;year&gt;\d{4})/(?P&lt;month&gt;\w{3})/(?P&lt;day&gt;\d{2})/(P?&lt;slug&gt;[-\w]+)/$', 'django.views.generic.date_based.object_detail', entry_info_dict),
  </code></pre>
  
  <p>in my URLConf should match.</p>
  
  <p>The only difference is the prefix for the language, but this does not affect the other patterns, so why should it affect only this. (All urlpatterns are matched, except the above one)</p>
  
  <p>My UrlConf looks like this:</p>
  
  <h3>urls.py</h3>
  
  <pre><code>from django.conf.urls.defaults import *
  from webpage import settings
  import os 
  
  # Uncomment the next two lines to enable the admin:
  from django.contrib import admin
  admin.autodiscover()
  
  from blog.models import Entry
  
  urlpatterns = patterns('preview.views',
      (r'^admin/(.*)', admin.site.root),
      (r'^$', 'home'),
      (r'^about_me.html/', 'show_about_me'),
      (r'^study.html/', 'show_study'),
      (r'^profile.html/', 'show_profile'),
      (r'^blog.html/', 'show_blog'),
      (r'^contact.html/', 'show_contact'),
      (r'^impressum.html/', 'show_impressum'),
  )
  
  entry_info_dict = {
      'queryset': Entry.objects.all(),
      'date_field': 'pub_date',
      }
  
  urlpatterns += patterns('',
      (r'^weblog/$', 'webpage.blog.views.entries_index'),
      (r'^weblog/(?P&lt;year&gt;\d{4})/(?P&lt;month&gt;\w{3})/(?P&lt;day&gt;\d{2})/(P?&lt;slug&gt;[-\w]+)/$', 'django.views.generic.date_based.object_detail', entry_info_dict),
  )
  
  if settings.DEBUG:
      urlpatterns += patterns('', 
      (r'^static/(?P&lt;path&gt;.*)$', 'django.views.static.serve', { 'document_root' : os.path.join(settings.CURRENT_PATH, 'static') }),
  )
  </code></pre>
  
  <p>What is the problem. I appreciate any help,</p>
  
  <p>Best regards.</p>