Display error messages

public/partials/anonymize.htm

@@ -459,7 +459,12 @@
               </div>
             </div>
           </div>
-
+          <div
+            class="alert alert-danger"
+            role="alert"
+            ng-if="error"
+            ng-bind="error"
+          ></div>
           <button
             id="submit"
             type="submit"