Magic words

I don't quite get what you are trying to do with that magic word. Can you elaborate the function/use case?

Yes. Siebrand told me that to use translated templates and categories we can add a subpage language code to their name and enclose it in translate tags (in the source page). But the language code can be added automatically on subpages, using that magic word, so translating it is useless.

Hmm. You can probably get it with some titleparts hackery because subpagename doesn't work everywhere. I think it's fine, but may reference templates which do not exist yet.