Notify: auto-retry once after 10 seconds

Also:
- Show the resume button on notify errors.
- Changed the error message to differentiate against v1's.

web/setup/publish-v2.js

@@ -56,7 +56,9 @@ export function makeResumableUploadRequest(
         window.store.dispatch(doUpdateUploadProgress({ params, progress: percentage }));
       },
       onSuccess: () => {
-        // Notify lbrynet server
+        let retries = 2;
+
+        function makeNotifyRequest() {
           const xhr = new XMLHttpRequest();
           xhr.open('POST', `${uploader.url}/notify`);
           xhr.setRequestHeader('Content-Type', 'application/json');
@@ -68,13 +70,22 @@ export function makeResumableUploadRequest(
             resolve(xhr);
           };
           xhr.onerror = () => {
-          reject(new Error(__('There was a problem with your upload. Please try again.')));
+            if (--retries > 0) {
+              // Auto-retry after 10s delay.
+              setTimeout(() => makeNotifyRequest(), 10000);
+            } else {
+              window.store.dispatch(doUpdateUploadProgress({ params, status: 'error' }));
+              reject(new Error(__('There was a problem in the processing. Please retry.')));
+            }
           };
           xhr.onabort = () => {
             window.store.dispatch(doUpdateUploadRemove(params));
           };
 
           xhr.send(jsonPayload);
+        }
+
+        makeNotifyRequest();
       },
     });