ISTWCMS-4818: improve a11y of disclaimer

source/_patterns/03-layouts/ofis/ofis.twig

@@ -61,13 +61,13 @@
   </ul>
 {% endif %}
 {% if ofis_data.courses %}
-  <h2>Courses*</h2>
+  <h2>Courses<a href="#disclaimer" id="courses" aria-label="note">*</a></h2>
   <ul>
     {% for course in ofis_data.courses %}
       <li>{{ course.subject }} {{ course.num }} - {{ course.title | raw }}</li>
     {% endfor %}
   </ul>
-  <small>* Only courses taught in the past 5 years are displayed.</small>
+  <p id="disclaimer"><small><a href="#courses" aria-label="back">*</a> Only courses taught in the past 5 years are displayed.</small></p>
 {% endif %}
 {% if ofis_data.contribution %}
   <h2>Selected/recent publications</h2>