I’m having trouble getting https://meta.miraheze.org/wiki/Template:Translatable_template to work. As you can see on https://meta.miraheze.org/wiki/No_open_proxies_policy the translation tags are still shown. The translate extension is installed.
Topic on Project:Support desk
To me this looks like an issue with "#invoke" as there's not even an error, the page is just blank.
The template page showed nothing because the code was wrapped in includeonly tags.
Got it working on https://applewiki.miraheze.org/wiki/Test though.