Fix HTML error

Author: ajoslin

index.html

@@ -1206,7 +1206,7 @@ <h3>How?</h3>
   <div class="modal-header"><h2>Create a Custom Build</h2></div>
   <div class="modal-body">
     <div ng-show="buildErrorText">
-      <h3 style="text-align: center;">{{buildErrorText</h3>
+      <h3 style="text-align: center;">{{buildErrorText}}</h3>
     </div>
     <div ng-hide="buildErrorText">
       <h3 style="text-align: center;">Select the modules you wish to download:</h3>