Fixes #99 - Added social media anchor titles, images alt text, and header to footer locale file

includes/footer.tmpl

 {% from "macros/pageitem" import pageitem %}
 
 <footer id="footer" class="content">
   <div class="container">
     <div class="row">
       <nav class="column one-fourth">
         <h5>{{ get_string("resources", "menu") }}</h5>
         <ul>
           {% for pagename in ["acceptable-ads", "documentation", "deployments", "bugs"] %}
             <li>{{ pagename | linkify }}{{ get_string(pagename, "menu") }}</a></li>
@@ skipping 11 matching lines @@
       </nav>
       <nav class="column one-fourth">
         <h5>{{get_string("development", "menu")}}</h5>
         <ul>
           {{ pageitem("source") }}
           <li><a href="https://issues.adblockplus.org/report/13" hreflang="en">{{ get_string("roadmap", "menu") }}</a></li>
           {{ pageitem("tools") }}
           <li><a href="https://eyeo.com/jobs/" hreflang="en">{{ get_string("jobs", "menu") }}</a></li>
         </ul>
       </nav>
+
       <nav id="social-list" class="column one-fourth">
-        <h5>{{get_string("follow-us", "menu")}}</h5>
+        <h5>{{get_string("follow-us-header", "footer")}}</h5>
         <ul>
           <li>
-            <a href="https://twitter.com/AdblockPlus" target="_blank">
+            <a
+              href="https://twitter.com/AdblockPlus"
+              title="{{ get_string("twitter-title", "footer") }}"
+              target="_blank">
               <img
                 src="/img/footer-twitter-glyphicon.png"
-                alt="{{ "Twitter" | translate("twitter-alt", "Twitter glyphicon alt text")}}">
+                alt="{{ get_string("twitter-alt", "footer") }}">
             </a>
           </li>
           <li>
-            <a href="https://www.youtube.com/user/AdblockPlusOfficial" target="_blank">
-              <img src="/img/footer-youtube-glyphicon.png">
+            <a
+              href="https://www.youtube.com/user/AdblockPlusOfficial"
+              title="{{ get_string("youtube-title", "footer") }}"
+              target="_blank">
+              <img
+                src="/img/footer-youtube-glyphicon.png"
+                alt="{{ get_string("youtube-alt", "footer") }}">
             </a>
           </li>
           <li>
-            <a href="https://www.facebook.com/adblockplus" target="_blank">
-              <img src="/img/footer-facebook-glyphicon.png">
+            <a
+              href="https://www.facebook.com/adblockplus"
+              title="{{ get_string("facebook-title", "footer") }}"
+              target="_blank">
+              <img
+                src="/img/footer-facebook-glyphicon.png"
+                alt="{{ get_string("facebook-alt", "footer") }}">
             </a>
           </li>
           <li>
-            <a href="https://www.instagram.com/adblockplus/" target="_blank">
-              <img src="/img/footer-instagram-glyphicon.png">
+            <a
+              href="https://www.instagram.com/adblockplus/"
+              title="{{ get_string("instagram-title", "footer") }}"
+              target="_blank">
+              <img
+                src="/img/footer-instagram-glyphicon.png"
+                alt="{{ get_string("instagram-alt", "footer") }}">
             </a>
           </li>
         </ul>
       </nav>
     </div> {# .row #}
+
     <div id="footer-legal">
       <p id="copyright-notice">{{ get_string("copyright", "footer") }}</p>
       <ul id="legal-list">
         {% for pagename in ["terms", "privacy", "impressum"] %}
           <li>{{ pagename | linkify }}{{ get_string(pagename, "menu") }}</a></li>
         {% endfor %}
       </ul>
     </div> {# #footer-legal #}
   </div> {# .container #}
 </footer> {# #footer #}