Pinned Django on < 2.0 for better compatibility.

Mainlined traslation code for better DRY workflow.
Fixed the EventDetail Mixin.

requirements/base.txt

@@ -1,5 +1,5 @@
 beautifulsoup4
-django
+django < 2.0
 django-appconf
 django-ckeditor
 django-contrib-comments
@@ -18,4 +18,4 @@ pytz
 requests
 requests-oauthlib
 social-auth-app-django
-social-auth-core
+social-auth-core

src/content/models.py

@@ -41,6 +41,14 @@ def get_upload_path(instance, filename):
         return "categories/%s.%s" % (instance.slug, extension)
 
 
+def get_localized(obj, attr):
+    """ Return the localilzed field, or the fallback if the localized is empty.
+    """
+    fallback = attr + '_de'
+    localized = attr + '_' + get_language()[:2]
+    return getattr(obj, localized) or getattr(obj, fallback)
+
+
 class ArticleManager(models.Manager):
     """Adds some predifined querys and joins some tables for faster querys."""
 
@@ -118,16 +126,12 @@ class Article(models.Model):
     @property
     def headline(self):
         """Return the localized headline, fallback to german if necessary."""
-        return mark_safe(
-            getattr(self, "headline_%s" % get_language(), self.headline_de)
-        )
+        return mark_safe(get_localized(self, 'headline'))
 
     @property
     def content(self):
         """Return the localized content, fallback to german if necessary."""
-        return mark_safe(
-            getattr(self, "content_%s" % get_language(), self.content_de)
-        )
+        return mark_safe(get_localized(self, 'content'))
 
 
 class Category(models.Model):
@@ -149,13 +153,12 @@ class Category(models.Model):
     @property
     def name(self):
         """Return the localized name, fallback to german if necessary."""
-        return getattr(self, "name_%s" % get_language(), self.name_de)
+        return get_localized(self, 'name')
 
     @property
     def description(self):
         """Return the localized description, fallback to german if necessary."""
-        return getattr(self, "description_%s" % get_language(),
-                       self.description_de)
+        return get_localized(self, 'description')
 
     def get_absolute_url(self):
         """Return the URL of the article archive, filtered on this category."""
@@ -264,9 +267,7 @@ class Page(models.Model):
     @property
     def content(self):
         """Return the localized content, fallback to german if necessary."""
-        return mark_safe(
-            getattr(self, "content_%s" % get_language()) or self.content_de
-        )
+        return mark_safe(get_localized(self, 'content'))
 
     @property
     def css_class(self):
@@ -278,24 +279,22 @@ class Page(models.Model):
     @property
     def description(self):
         """Return the localized description, fallback to german if necessary."""
-        return getattr(self,
-                       "description_%s" % get_language()) or self.description_de
+        return get_localized(self, 'description')
 
     @property
     def menu_name(self):
         """Return the localized menu name, fallback to german if necessary."""
-        return getattr(self,
-                       "menu_name_%s" % get_language()) or self.menu_name_de
+        return get_localized(self, 'menu_name')
 
     @property
     def pdf_file(self):
         """Return the localized PDF file, fallback to german if necessary."""
-        return getattr(self, "pdf_%s" % get_language(), self.pdf_de)
+        return get_localized(self, 'pdf_file')
 
     @property
     def title(self):
         """Return the localized title, fallback to german if necessary."""
-        return getattr(self, "title_%s" % get_language()) or self.title_de
+        return get_localized(self, 'title')
 
     def clean(self):
         """set the URL path, the right content type, and scrub the HTML code."""

src/events/mixins.py

@@ -48,9 +48,13 @@ class EventDetailMixin(object):
 
         :return: a django QuerySets
         """
-        try:
-            self.event = models.Event.objects.get(pk=self.kwargs['event'])
-            queryset = self.model.objects.filter(event=self.event)
-        except models.Event.DoesNotExist:
-            raise Http404(_('Event does not exist'))
+        if self.model == models.Event:
+            self.event = models.Event.objects.get(pk=self.kwargs['pk'])
+            queryset = self.model.objects.all()
+        else:
+            try:
+                self.event = models.Event.objects.get(pk=self.kwargs['event'])
+                queryset = self.model.objects.filter(event=self.event)
+            except models.Event.DoesNotExist:
+                raise Http404(_('Event does not exist'))
         return queryset.prefetch_related()