Typing Other Languages on an iPad with a Hardware Keyboard
When using a hardware keyboard to type other languages with an iPad or other iOS device, you may need to go into Settings > General > Keyboard > Hardware Keyboards in order to match the layout there with whatever is printed on the keys of your hardware. Unfortunately Apple supplies only a limited selection of such layouts, so an exact match may not be possible. For example, if your keyboard requires the British PC layout, you are out of luck.
A list of the layouts available in iOS 9 is at:
https://dl.dropboxusercontent.com/u/46870715/s/ios9kbs.html
As far as I know, 3rd party keyboards do not include hardware layouts.