feat: Add notification counter

src/fellchensammlung/templates/fellchensammlung/header.html

@@ -18,7 +18,15 @@
         <div class="profile-card">
             {% include "fellchensammlung/forms/change_language.html" %}
             {% if user.is_authenticated %}
-                <a class="btn2" href="{{ user.get_notifications_url }}"><i class="fa fa-bell" aria-hidden="true"></i></a>
+
+                <div class="btn2 button_darken btn-notification">
+                    <a href="{{ user.get_notifications_url }}">
+                        <i class="fa fa-bell" aria-hidden="true"></i>
+                    </a>
+                    <span class="button__badge">4</span>
+
+                </div>
+
                 <a class="btn2" href="{{ user.get_absolute_url }}"><i aria-hidden="true" class="fas fa-user"></i></a>
                 <form class="btn2 button_darken" action="{% url 'logout' %}" method="post">
                     {% csrf_token %}