Course Presentation

The Lumi App Missing translations for library H5PEditor.CoursePresentation Error

Hello. I'm new to the forum. So I want help from you in the error I got by opening a new title. I downloaded the Lumi app and also installed some tools. However, when I want to use the coursepresentation tool, I get an error "Missing translations for library H5PEditor.CoursePresentation".

My OS is Windows10 x64bit

I would be glad if you could help. 

I'v no problem on my own local server with H5P on Drupal 8, it works perfectly. But with the same installation on the shared Hosting (Hostinger) I work with, I can use all H5P Content except Branching Scenario, Column, Course Presentation, Image Pairing, Interactive Book. I have changed any PHP parameters I can change (because of the limitation of Sharing Hosting) :

Hi!

I noticed this morning that all the youtube videos I have embedded into interactive books and course presentations are not playing when I'm using Chrome on my Mac. They play fine in Firefox and Safari, and Chrome on my iPhone. I've disabled add blockers, etc., and restarted Chrome, but it doesn't solve it.

I've attached a screenshot of the error message, which points me to this less-than-helpful help file.