[Gelöst] Default language pages give error 500 after deleting the translated version

Background of the issue:
I did some updates to my default language home page and wanted to retranslate it, so I chose it and did an auto translate, but the new changes didn't show in the Arabic version (old page was still showing). So I decided to move the Arabic versions to trash and retranslate everything again.

Symptoms:
After deleting the translated version and emptying the trash, none of my original English pages show, and I get error 500. Also, the front page moved to the blog instead of my static page.

Questions:
Why do I get error 500 on my default language pages after deleting the translated version?
How can I restore my static front page instead of it showing the blog?