Constructed language topic categories
Fragment of a discussion from User talk:TheDaveRoss
Oh, yes, I mistook what you were saying the problem was. I think that it could be avoided by not using {{topic cat}}, but maybe there is a better way.
I would propose adding a prefix to the "by language" topic categories. So the parent of Category:en:Constructed languages would be Category:ALL:Constructed languages or something similar, rather than the current Category:Constructed languages. This would also avoid any future name clashes of this kind.