Why should them, if no such messages don't exist?

Interesting considering that https://pt.wikipedia.org/w/index.php?title=Wikipédia:Página_de_testes/1&oldid=47526682&uselang=qqx shows that message name.

{{INT}} will show in qqx you any name you pass to it. If you mean the tab itself, it uses a special mechanism where it tries multiple messages to see which one exists (if any) before falling back to the namespace name. Given how qqx is implemented, it will only show the first message tried, not the message that is actually used.

In T153867#2895685, @Nikerabbit wrote:

{{INT}} will show in qqx you any name you pass to it. If you mean the tab itself, it uses a special mechanism where it tries multiple messages to see which one exists (if any) before falling back to the namespace name. Given how qqx is implemented, it will only show the first message tried, not the message that is actually used.