Improve error message to give additional context.
@@ -718,7 +718,8 @@ command.world.create.exists=&cA world with the name &e{0}&c already exists.
command.world.create.success=&aThe world &e{0} &ahas been created.
command.world.create.newparams=&aDimension: &e{0}&a, Generator: &e{1}&a, Modifier: &e{2}&a, Gamemode: &e{3}&a, Difficulty: &e{4}&a.
command.world.create.newparams2=&aLoad on startup: &e{0}&a, Keep spawn loaded: &e{1}&a, Generate structures: &e{2}&a, Allow commands: &e{3}&a, Generate bonus chest: &e{4}&a.
-command.world.create.worldfailedtoload=&aThe world &e{0} &awas created, but could not be loaded.
+command.world.create.worldfailedtoload=&aThe world &e{0} &awas created, but could not be loaded. This might be because "allow-nether" is set to \
+ false in "server.properties", it must be set to true.
command.world.create.fail=&cCould not create the world &e{0}&c.
command.world.create.couldnotsave=&cCould not save the world properties for the world &e{0}&c.
