Add a more visible link to register account in the MOTD section

the register account link is in the top-right menu, under
"Welcome Guest". This change adds a bit of text into the MOTD area
of the login screen to make registrations easier!

tcms/templates/registration/login.html

@@ -52,10 +52,16 @@
       <p>
         {% if SETTINGS.MOTD_LOGIN %}
             {{ SETTINGS.MOTD_LOGIN|safe}}
-        {% else %}
-            Please login to get started.
         {% endif %}
       </p>
+      <p>
+        Please login to get started
+        {% if AUTH_BACKEND.can_register %}
+        or <a href="{% url "tcms-register" %}" style="color:white;text-decoration:underline">register an account</a>
+        if you don't have one
+        {% endif %}
+        !
+      </p>
     </div><!--/.col-*-->
   </div><!--/.row-->
 </div><!--/.container-->