[BTN] lang user

templates/pages/menu.html

@@ -103,6 +103,9 @@
                             </ul>
                         </li>
                     </ul>
+                    <ul class="nav navbar-nav pull-right">
+                      <button class="btn primary_keylang">{{user_parameters["language"]}}</button>
+                    </ul>
                 </div>
             </div>
             {% if corpus %}