Ok, so now I used Google translate to translate “Global Cloudflare Outage” back into Chinese.
Then I used the post-pencil and edited the Chinese topic title.
Then I had to use the post-pencil and edit the English topic title, which got me where I wanted to be.
However, when I switch to German, it still says “Als ich aufwachte, explodierten sie alle”. And I assume that goes for every other language as well.
So I guess that in addition to your proposed workaround, an edit of the original title should also trigger a re-translation of the title into the other languages.