I think it's true anywhere. It looks like most cultures take the swallow as good fortune. You're welcome
Well, many people in my country take it as sign of very bad fortune, even death. I don't believe in superstitions or any other supernaturals but I'll stick to English version just in case
For the sake of having fun, I'd say that's a good plan. I'm fascinated by superstitions in the sense that I want to know how on earth they came about, but wouldn't call myself a believer either. It's fun to research them though. I'm a dork that way.