some questions on Ancillaries/Scripts

[Bardo]

and some messages work only for certain cultures

Aaaaaah, this is the reason it didn't work for me, I was trying roman messages with Greek factions.
Thank you a lot The_Mark, I'll continue trying some different messages.

Anyway, if somebody knows of a message working for all cultures, please say it here.

[The_Mark]

I'm not sure, but daughter_retired might be one. If you have EB scripts at your disposal, you could search there as well for test_message commands. There are few messages that are used for non-"roman" factions, they *should* work regardless of culture.