Closes #244 improved text message in button to go back

smash/web/templates/subjects/visit_details.html

@@ -24,7 +24,7 @@
         <div class="box box-info">
             <div class="box-header with-border">
                 <a href="{% url 'web.views.subject_edit' id %}"
-                   class="btn btn-block btn-default">Subject</a>
+                   class="btn btn-block btn-default">Go back to Subject (discard changes)</a>
                 {% if allow_add_visit %}
                     <a href="{% url 'web.views.visit_add' id %}" type="button" class="btn btn-block btn-default">
                         Add visit</a>