feat: Make notification counter display actual number of notifications

src/fellchensammlung/models.py

@@ -71,6 +71,9 @@ class User(AbstractUser):
     def get_notifications_url(self):
         return self.get_absolute_url()
 
+    def get_num_unread_notifications(self):
+        return BaseNotification.objects.filter(user=self,read=False).count()
+
 
 class Image(models.Model):
     image = models.ImageField(upload_to='images')

src/fellchensammlung/templates/fellchensammlung/header.html

@@ -23,7 +23,7 @@
                     <a href="{{ user.get_notifications_url }}">
                         <i class="fa fa-bell" aria-hidden="true"></i>
                     </a>
-                    <span class="button__badge">4</span>
+                    <span class="button__badge">{{ user.get_num_unread_notifications }}</span>
 
                 </div>