say Login / Register for browserID on mobile

apps/users/templates/users/mobile/login.html

@@ -2,6 +2,8 @@
 
 {% block title %}{{ page_title(_('User Login')) }}{% endblock %}
 
+{% block aux_nav %}{% endblock %}
+
 {% block js %}
   {% if form.recaptcha %}
     {% include("amo/recaptcha_js.html") %}

templates/mobile/base_addons.html

@@ -74,7 +74,9 @@
                 </li>
               {% endblock %}
             </ul>
-            {% include "mobile/header_auth.html" %}
+            {% block aux_nav %}
+              {% include "mobile/header_auth.html" %}
+            {% endblock %}
           </nav>
         </header>
       {% endblock %}

templates/mobile/base_apps.html

@@ -55,7 +55,9 @@
                   {{ loc('Home') }}</a></li>
               {% endblock %}
             </ul>
-            {% include "mobile/header_auth.html" %}
+            {% block aux_nav %}
+              {% include "mobile/header_auth.html" %}
+            {% endblock %}
           </nav>
           {% block search %}{% endblock %}
         </header>

templates/mobile/header_auth.html

@@ -6,10 +6,16 @@
     <li class="logout"><a href="{{ url('users.logout') }}">
       {{ _('Log out') }}</a></li>
   {% else %}
-    {% if not settings.APP_PREVIEW %}
-      <li class="register"><a href="{{ url('users.register') }}">
-        {{ _('Register') }}</a></li>
+    {% if waffle.switch('browserid-login') %}
+      <li class="login"><a href="{{ login_link() }}">
+        {{ loc('Log in / Register')  }}</a></li>
+    {% else %}
+      {% if not settings.APP_PREVIEW %}
+        <li class="register"><a href="{{ url('users.register') }}">
+          {{ _('Register') }}</a></li>
+      {% endif %}
+      <li class="login"><a href="{{ login_link() }}">{{ _('Log in')  }}</a></li>
     {% endif %}
-    <li class="login"><a href="{{ login_link() }}">{{ _('Log in')  }}</a></li>
+
   {% endif %}
 </ul>