More icons and properly translated text for the header (search form)

templates/bootstrap/header.html

@@ -20,9 +20,9 @@
       </ul>
       <form id="searchForm" class="navbar-form navbar-right" role="search">
         <div class="form-group">
-          <input type="text" class="form-control" placeholder="Search" name="query">
+          <input type="text" class="form-control" placeholder="{{=it.c.i18n.searchAlt}}" name="query">
         </div>
-        <button type="submit" class="btn btn-default">Submit</button>
+        <button type="submit" class="btn btn-default"><span class="glyphicon glyphicon-search"></span></button>
       </form>
     </div><!--/.nav-collapse -->
   </div>