add preferences link to the index page

main/webapp/modules/core/index.vt

@@ -58,6 +58,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
         <div id="openrefine-version"></div>
       </div>
       <ul>
+        <li><a href="preferences" id="or-index-pref"></a></li>
         <li><a href="https://github.com/OpenRefine/OpenRefine/wiki/Documentation-For-Users" id="or-index-help"></a></li>
         <li><a href="about.html" id="or-index-about"></a></li>
       </ul>

main/webapp/modules/core/scripts/index.js

@@ -202,6 +202,7 @@ $(function() {
   Refine.selectActionArea('create-project');
   
   $("#slogan").text($.i18n._('core-index')["slogan"]+".");
+  $("#or-index-pref").text($.i18n._('core-index')["preferences"]);
   $("#or-index-help").text($.i18n._('core-index')["help"]);
   $("#or-index-about").text($.i18n._('core-index')["about"]);
   $("#or-index-noProj").text($.i18n._('core-index')["no-proj"]+".");