Sorry! - I'm English, I only know English and I've always struggled with it.
I don't know if you can get an app for the N97 which will tell you what channels WiFi uses (didn't load many apps on my N97). But you can for the N900 called WifiInfo in the fremantle repository, don't know if that will help.
I have never understood why the WiFi selection tool doesn't tell you - so useful when setting up a wireless network.