I posted a message on the Portuguese community thread:
This is a European project I’m working on (outside of OSM), but essentially it’s something that needs to be parsed (or not) by local communities. I would like to post the same message in the other active countries where it is applicable (Hungary, Romania, Poland) and gradually also to the other countries that I parse.
Maybe it should be considered a meta question for how to use Discourse 🐞 This forum issues and requests - OpenStreetMap Community Forum
I suppose you can only manually post this to every one of them. There’s no Europe, continent, or any subcategory. Basically the same as how old forums work.
No discourse power user here, but I would create one single topic in the “General Talk” section.
You can try tagging the respective countries with hashtags, e.g. users: Albania
But I’m not sure what the effect of this is, but you could just try it out.
A thread for the whole topic would have a few advantages for me. You can consolidate communication about your code in one place. It’s true that specific questions about a country then mix the thread, but do you have to assume that there will be controversy? Some of the countries you listed are not even active here - see Albania. And if new countries are added, you can simply post an update.
Sidenote: in Hungary, due to the official regulation of the .HU domain it is with extremely high probability that the <settlement name>.hu name is the official name of the settlement, if exists. (There are about five exceptions or so, mainly due to registrations before the rule.)