Link to German api-quick-start

Add link to the index page for newly translated document.

Change-Id: I9b578fe66586e8cd979516fa6bcb62548c84b66b

www/index.html

@@ -610,9 +610,7 @@
             </div>
          </div>
          <div id="api">
-            <h2>
-               APIs
-            </h2>
+            <h2>APIs</h2>
             <p>
                An application programming interface (API) lets you access service
                capabilities through predefined functions.
@@ -624,6 +622,7 @@
             </p>
             <h3>Translations</h3>
             <ul>
+              <li><a href="https://developer.openstack.org/de/api-guide/quick-start/">German (de)</a></li>
               <li><a href="https://developer.openstack.org/id/api-guide/quick-start/">Indonesian (id)</a></li>
               <li><a href="https://developer.openstack.org/ja/api-guide/quick-start/">Japanese (ja)</a></li>
               <li><a href="https://developer.openstack.org/ko_KR/api-guide/quick-start/">Korean (ko_KR)</a></li>
@@ -631,9 +630,7 @@
             </ul>
          </div>
          <div id="cli">
-            <h2>
-               CLIs
-            </h2>
+            <h2>CLIs</h2>
             <p>
                A command-line interface (CLI) is a text-based client that helps
                you create scripts to interact with OpenStack clouds.