Add a button to go back to the "My students" overview if viewing a person in detail

aleksis/apps/alsijil/templates/alsijil/class_register/person.html

@@ -9,6 +9,13 @@
 
 
 {% block page_title %}
+  {% has_perm "alsijil.view_my_students" user as has_students %}
+  {% if has_students %}
+    <a href="{% url "my_students" %}"
+    class="btn-flat primary-color-text waves-light waves-effect btn-large">
+      <i class="material-icons center">chevron_left</i>
+    </a>
+  {% endif %}
   {% blocktrans with person=person %}
     Class register overview for {{ person }}
   {% endblocktrans %}