When streaming API is disconnected, poll home/notifications (#2776)

* When streaming API is disconnected, poll home/notifications
Display slightly different empty home timeline message if user is following others
Cull notifications to 20 items when over 40 get added in real-time
Run manage:translations

* Optimize <HomeTimeline /> a little

1 files changed, 10 insertions, 2 deletions

diff --git a/app/javascript/mastodon/reducers/notifications.js b/app/javascript/mastodon/reducers/notifications.js
index c567a3a59..6d53a0ae6 100644
--- a/app/javascript/mastodon/reducers/notifications.js
+++ b/app/javascript/mastodon/reducers/notifications.js
@@ -29,11 +29,19 @@ const notificationToMap = notification => Immutable.Map({
 });
 
 const normalizeNotification = (state, notification) => {
-  if (!state.get('top')) {
+  const top = state.get('top');
+
+  if (!top) {
     state = state.update('unread', unread => unread + 1);
   }
 
-  return state.update('items', list => list.unshift(notificationToMap(notification)));
+  return state.update('items', list => {
+    if (top && list.size > 40) {
+      list = list.take(20);
+    }
+
+    return list.unshift(notificationToMap(notification));
+  });
 };
 
 const normalizeNotifications = (state, notifications, next) => {