fixes #5416: use correct variable for inverse navbar responsive links

docs/assets/css/bootstrap-responsive.css

@@ -1002,6 +1002,10 @@
   .nav-collapse .dropdown-menu a:hover {
     background-color: #f2f2f2;
   }
+  .navbar-inverse .nav-collapse .nav > li > a,
+  .navbar-inverse .nav-collapse .dropdown-menu a {
+    color: #999999;
+  }
   .navbar-inverse .nav-collapse .nav > li > a:hover,
   .navbar-inverse .nav-collapse .dropdown-menu a:hover {
     background-color: #111111;

less/responsive-navbar.less

@@ -84,6 +84,10 @@
   .nav-collapse .dropdown-menu a:hover {
     background-color: @navbarBackground;
   }
+  .navbar-inverse .nav-collapse .nav > li > a,
+  .navbar-inverse .nav-collapse .dropdown-menu a {
+    color: @navbarInverseLinkColor;
+  }
   .navbar-inverse .nav-collapse .nav > li > a:hover,
   .navbar-inverse .nav-collapse .dropdown-menu a:hover {
     background-color: @navbarInverseBackground;