No, this field shows up when page/version of the page is being marked for translation. You can see it here: (link will expire if someone marks the page)
No, it concerns only some links (or pages).
When you look up links in Main Page, for example [[About| About]] it works fine, but [[Dev/Build Documentation]] which you can find on Develop page won't.
I discovered this when trying to translate it to Polish (you can see that link is broken).
In Zzztranslatetest is modifed, working version of this link - [https://www.whonix.org/wiki/Dev/Build_Documentation Dev/Build Documentation]
Now here comes the best part. Those two links seem to be the same type, first is from Main Page, second from Develop. First works, second breaks (you can lookup the second in Zzztranslatetest copy of Develop)
[https://github.com/Whonix/Whonix/issues Development Tickets, Bugs, Feature Requests, Roadmap]
The cause of this is beyond my understanding, because everything works in Main Page. Any ideas?