Fix #1490 disabled nav tab

build/less/navs.less

@@ -68,10 +68,16 @@
   > .nav-tabs {
     margin: 0;
     border-bottom-color: #f4f4f4;
+
     .border-top-radius(@box-border-radius);
     > li {
       border-top: 3px solid transparent;
       margin-bottom: -2px;
+
+      &.disabled > a {
+        color: #777;
+      }
+
       > a {
         color: #444;
         .border-radius(0);

dist/css/AdminLTE.css

@@ -2489,6 +2489,9 @@ a:focus {
   margin-bottom: -2px;
   margin-right: 5px;
 }
+.nav-tabs-custom > .nav-tabs > li.disabled > a {
+  color: #777;
+}
 .nav-tabs-custom > .nav-tabs > li > a {
   color: #444;
   border-radius: 0;

dist/css/alt/AdminLTE-without-plugins.css

@@ -2490,6 +2490,9 @@ a:focus {
   margin-bottom: -2px;
   margin-right: 5px;
 }
+.nav-tabs-custom > .nav-tabs > li.disabled > a {
+  color: #777;
+}
 .nav-tabs-custom > .nav-tabs > li > a {
   color: #444;
   border-radius: 0;