[تم الحل] a page doesn't translate + extra questions

Background of the issue:
I am trying to translate a page on my site الرابط المخفي using WPML. The specific page I am working on is الرابط المخفي.

Symptoms:
The page translation seems to be stuck and does not complete.

Questions:
Why is the page translation stuck?
How can I successfully translate the page?