Question 1
Thank you for sharing the troubleshooting page. I need to replicate what you did on the production website. Hence, I hope you can give me specific steps. Please also advise me on what caused the issue. This is so I can avoid the cause in the future.
Question 2
My apologies, I'm afraid you misunderstood me. When I click on the Chinese homepage in the Cornerstone editor, the content is in English. It used to be Chinese content.
Question 3
Going into Cornerstone editor, you will find Single Layouts and Archive Layouts. These are templates for Post listing and individual posts. You'd notice the two listed are in English. It is as if the Chinese listing has been removed (see attached screenshot).
Please click on the below URLs to prove my point hidden link hidden link
To conclude, the burning question I have is what happened? It seems like the database got corrupted. If so, what caused it?
I'll be taking over this ticket too. I've checked and it looks like the issue is similar to your other ticket. I cannot edit the cornerstone template as I'm getting '500" when trying to edit it with WPML activated. We'll refer to this ticket for now https://wpml.org/forums/topic/wpml-crashes-the-translated-site/