Add placeholder text to navbar search

src/UI/Content/navbar.less

@@ -210,4 +210,24 @@
       }
     }
   }
+
+  ::-webkit-input-placeholder {
+    color: #cccccc;
+    opacity: 0.25;
+  }
+
+  :-moz-placeholder { /* Firefox 18- */
+    color: #cccccc;
+    opacity: 0.25;
+  }
+
+  ::-moz-placeholder {  /* Firefox 19+ */
+    color: #cccccc;
+    opacity: 0.25;
+  }
+
+  :-ms-input-placeholder {
+    color: #cccccc;
+    opacity: 0.25;
+  }
 }

src/UI/Navbar/NavbarLayoutTemplate.hbs

@@ -39,7 +39,7 @@
         <div class="col-md-6 col-md-offset-3">
             <div class="input-group">
                 <span class="input-group-addon"><i class="icon-search"></i></span>
-                <input type="text" class="col-md-6 form-control x-series-search" >
+                <input type="text" class="col-md-6 form-control x-series-search" placeholder="Search the series in your library">
             </div>
         </div>
     </div>