stackdriver: change name of authentication type

public/app/plugins/datasource/stackdriver/config_ctrl.ts

@@ -20,7 +20,7 @@ export class StackdriverConfigCtrl {
     this.current.secureJsonFields = this.current.secureJsonFields || {};
     this.authenticationTypes = [
       { key: this.defaultAuthenticationType, value: 'Google JWT File' },
-      { key: 'gce', value: 'Use GCE default Authentication' },
+      { key: 'gce', value: 'GCE Default Service Account' },
     ];
   }
 

public/app/plugins/datasource/stackdriver/partials/config.html

@@ -34,7 +34,7 @@
 
 <div class="gf-form-group">
   <div class="gf-form">
-    <h3>Service Account Authentication</h3>
+    <h3>Authentication</h3>
     <info-popover mode="header">Upload your Service Account key file or paste in the contents of the file. The file
       contents will be encrypted and saved in the Grafana database.</info-popover>
   </div>
@@ -102,4 +102,4 @@
     class="fa fa-save"></i> Do not forget to save your changes after uploading a file.</p>
 
 <p class="gf-form-label" ng-show="ctrl.current.jsonData.authenticationType !== ctrl.defaultAuthenticationType"><i class="fa fa-save"></i>
-  Verify GCE automatic authentication by clicking Save & Test</p>
\ No newline at end of file
+  Verify GCE default service account by clicking Save & Test</p>
\ No newline at end of file