Added tooltip to `MenuBoard` button

client/components/boards/boardHeader.jade

@@ -92,7 +92,7 @@ template(name="boardHeaderBar")
               i.fa.fa-times-thin
 
       .separator
-      a.board-header-btn.js-open-board-menu
+      a.board-header-btn.js-open-board-menu(title="{{_ 'boardMenuPopup-title'}}")
         i.board-header-btn-icon.fa.fa-navicon
 
 template(name="boardMenuPopup")