config_service: make validation errors more distinguishable

appengine/config_service/ui/src/config-ui/config-set-card.html

 <!--
   Copyright 2017 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 -->
 
 <link rel="import" href="../../bower_components/iron-icons/iron-icons.html">
 <link rel="import" href="../../bower_components/paper-button/paper-button.html">
 <link rel="import" href="../../bower_components/paper-card/paper-card.html">
 <link rel="import" href="../../bower_components/polymer/polymer.html">
@@ skipping 58 matching lines @@
                 <paper-tooltip for="successful-import" offset="0">
                   Last import succeeded.
                 </paper-tooltip>
               </template>
               <template is="dom-if" if="[[_not(lastImportAttempt.success)]]" restamp="true">
                 <iron-icon id="failed-import"
                            icon="icons:warning"
                            class="paper-red">
                 </iron-icon>
                 <paper-tooltip for="failed-import" offset="0">
-                  Last import failed.
+                  Last import failed. Click for more info.
                 </paper-tooltip>
               </template>
             </template>
             <template is="dom-if" if="[[_not(lastImportAttempt)]]" restamp="true">
               <iron-icon id="no-import"
                          icon="icons:help"
                          class="paper-grey">
               </iron-icon>
               <paper-tooltip for="no-import" offset="0">
                 Last import attempt info not available.
@@ skipping 26 matching lines @@
         window.open(this.link);
       },
 
       _openConfigPage: function() {
         window.location.href = window.location.href + this.name;
       },
     });
   </script>
 </dom-module>