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Specifically prohibited are actions to rename the nation or cities to something that is clearly not in keeping with the national identity. Changing a nation or city name is acceptable as long as it within the cultural context.
However, the sentence before that reads:
Players are free to not participate the cultural workings of a nation however they should respect the actions of the players that do.
To my understanding, Moderation has long interpreted this to mean that the use of English for party names, nation names and constitutional titles might possibly mean not participating in the cultural workings of a nation, which is legal. But it does not necessarily mean doing "something that is clearly not in keeping with the national identity", which would be considered illegal. Changing the names in a Georgian nation to Finnish without any acceptable explanation, for example, would not be in keeping with its national identity. English, however, can be considered acceptably neutral.