Remove icons from the menus to de-clutter the UI and make it more consistent with most OSs.

web/pgadmin/static/css/bootstrap.overrides.css

@@ -104,7 +104,7 @@ iframe {
     border-width: 5px 0 5px 5px;
     border-left-color: #cccccc;
     margin-top: 5px;
-    margin-right: -10px;
+    margin-right: -2px;
 }
 
 .dropdown-submenu:hover>a:after {
@@ -152,6 +152,10 @@ iframe {
     margin-bottom: 0;
 }
 
+.dropdown-menu > li > a {
+  padding: 3px 5px;
+}
+
 .dropdown-menu > li > a > i {
     margin-left: -17px;
     width: 13px;