Implemented css working indicator

public/res/extensions/workingIndicator.js

@@ -18,8 +18,8 @@ define([
         $workingIndicatorElt = $(".working-indicator");
         for (var i = 0; i < 4; i++) {
             $workingIndicatorElt.append($('<div class="bar">').css({
-                'animation-delay': '0.' + (i*2) + 's',
-                '-webkit-animation-delay': '0.' + (i*2) + 's',
+                'animation-delay': (i*2/10).toPrecision(3) + 's',
+                '-webkit-animation-delay': (i*2/10).toPrecision(3) + 's',
             }));
         }
     };

public/res/styles/main.less

@@ -343,7 +343,6 @@ a {
             border-radius: 1px;
             margin: 0 2px;
             background-color: @btn-success-color;
-            opacity: 0;
             animation: indicator 0.6s ease-out infinite;
             -webkit-animation: indicator 0.6s ease-out infinite; /* Safari and Chrome */
 		}