New: Display indexer in download failed details

(cherry picked from commit a324052debf63a8db73a2f3c79201864892bb62c)

frontend/src/Activity/History/Details/HistoryDetails.js

@@ -172,7 +172,8 @@ function HistoryDetails(props) {
 
   if (eventType === 'downloadFailed') {
     const {
-      message
+      message,
+      indexer
     } = data;
 
     return (
@@ -192,6 +193,14 @@ function HistoryDetails(props) {
             null
         }
 
+        {
+          indexer ? (
+            <DescriptionListItem
+              title={translate('Indexer')}
+              data={indexer}
+            />
+          ) : null}
+
         {
           message ?
             <DescriptionListItem