Handle Unsynced messages

app/src/main/java/chat/rocket/android/renderer/MessageRenderer.java

@@ -75,10 +75,11 @@ public class MessageRenderer extends AbstractRenderer<Message> {
     }
 
     switch (object.getSyncState()) {
-      case SyncState.NOT_SYNCED:
       case SyncState.SYNCING:
         textView.setText(R.string.sending);
         break;
+      case SyncState.NOT_SYNCED:
+        textView.setText(R.string.failed_to_sync);
       default:
         textView.setText(DateTime.fromEpocMs(object.getTimestamp(), DateTime.Format.TIME));
         break;

app/src/main/res/values/strings.xml

@@ -16,6 +16,7 @@
     <string name="users_of_room_title">Members List</string>
     <string name="fmt_room_user_count">Total: %,d users</string>
     <string name="sending">Sending…</string>
+    <string name="failed_to_sync">Failed to send!</string>
     <string name="resend">Resend</string>
     <string name="discard">Discard</string>