Replace "Class" by "Group"

aleksis/apps/chronos/templates/chronos/all.html

@@ -22,7 +22,7 @@
     </div>
 
     <div class="col s12 m4">
-      <h5>{% trans "Classes" %}</h5>
+      <h5>{% trans "Groups" %}</h5>
 
       {% for class in classes %}
         <a class="waves-effect waves-light btn btn-timetable-quicklaunch primary"

aleksis/apps/chronos/templates/chronos/timetable.html

@@ -26,7 +26,7 @@
 
       {# Show class teacher and deputy class teacher #}
       {% if type == "group" and el.owners.all %}
-        <h5>{% trans "Class teachers:" %}
+        <h5>{% trans "Group teachers:" %}
           {% for teacher in el.owners.all %}
             <span data-position="bottom" class="tooltipped"
                   data-tooltip="{{ teacher }}">