Resolve "Check (responsive) design"

Closes #94 (closed)

Closes #100 (closed)

Closes #101 (closed)

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

@@ -66,9 +66,9 @@
           {% endif %}
         </li>
       {% empty %}
-        <li class="collection-item avatar">
+        <li class="collection-item avatar valign-wrapper">
           <i class="material-icons left circle green white-text">check</i>
-          <div class="flow-text">{% trans "There are no unexcused lessons." %}</div>
+          <span class="title">{% trans "There are no unexcused lessons." %}</span>
         </li>
       {% endfor %}
     </ul>