cmd/syncthing: Add more stats to usage reports (ref #3628)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4347

gui/default/syncthing/usagereport/usageReportPreviewModalView.html

@@ -5,8 +5,13 @@
     </p>
     <p translate>The aggregated statistics are publicly available at the URL below.</p>
     <p><a href="https://data.syncthing.net/" target="_blank">https://data.syncthing.net/</a></p>
+    <label translate>Version</label>
+    <select id="urPreviewVersion" class="form-control" ng-model="$parent.$parent.reportDataPreviewVersion" ng-change="refreshReportDataPreview()" >
+      <option ng-repeat="n in urVersions()" value="{{n}}">Version {{n}}</option>
+    </select>
+    <hr>
     <form>
-      <textarea class="form-control" rows="20">{{reportData | json}}</textarea>
+      <textarea class="form-control" rows="20" ng-if="reportDataPreview">{{reportDataPreview | json}}</textarea>
     </form>
   </div>
   <div class="modal-footer">