If you don’t speak the local language or aren’t familiar with the area, look at a map. Ask online. Do something to cover your butt. If anyone going to any airport in the world is confused because they don’t understand the local language, then it’s their own fault for not planning their trip carefully. If I (an American) was spending hundreds (or thousands) of dollars on a plane ticket, you can be damn sure I’d triple check the name and location of the airport to be sure it was the one I wanted to go to.
Having said that, San Francisco Bay Oakland International Airport is an unnecessarily confusing, cumbersome name. Come on, Oakland. You can do better.