Add note on discontinuation of registration 2020

Author: Benjamin Bach

kalite/packages/bundled/securesync/templates/securesync/register_public_key_client.html

@@ -85,7 +85,7 @@ <h4 class="reg-dev-title-info">{% trans "One-click registration (no online acces
                     {% trans "One-click registration now!" %}
                 </a>
                 <p>
-                    <em>{% trans "If nothing happens when you click this button, please check that an ad-blocker isn't active and blocking the request to kalite.learningequality.org." %}</em>
+                    <em>{% trans "Having problems? If nothing happens when you click this button, please check that an ad-blocker isn't active and blocking the request to kalite.learningequality.org." %}</em>
                 </p>
             </div>
 
@@ -100,6 +100,9 @@ <h4 class="reg-dev-title-info">{% trans "Register with online access to data!" %
                 <a class="btn btn-success" role="button" id="online-register" href="{{ classic_registration_url }}">
                     {% trans "Register with an online account now!" %}
                 </a>
+                <p>
+                    <em>{% trans "You can only register with existing accounts, creating new accounts has been discontinued as of January 2020." %}</em>
+                </p>
             </div>
 
     </div>