Christina Bunker wasn’t thinking about the global economy when she created the North Atlanta International Academy.She opened the language immersion school in south Forsyth for her daughter to become culturally minded. “When she was born, I said this is really something I want to explore and give her so she can have the same format that I grew up with,” said Bunker, who was raised bilingual in Belgium.When the academy opened eight years ago, French and English were offered. Since then, however, the school has added German, Mandarin and Spanish, with each of the 70 students taking as many as three languages.