One common error in internationalization is to think that all shortcuts must be translated. People forgot that one of the major advantages of the shortcuts is that they are memorized their position on the keyboard and not by the sign on the key.
From my point of view there are two types of keyboard shortcuts: the mnenonics (hot keys) and the normal keyboard shortcuts. Mnemonics are the underlined letters and they are fully translatable.
Position is more important than the letter on the key.
One simple example is the Cut-Copy-Paste group they are all consecutive keys on the keyboard and are accesible only with one hand (Ctrl-X, Ctrl-C, Ctrl-V).
Anoher example would be the Undo function that is using Ctrl-Z on English. On a French keyboard it should map to Ctrl-Y because ‘Y’ and ‘Z’ are switched on these keyboards and we need to keep the position.
Use the virtual key codes for remembering the shortcuts
In order to be able to make the shortcuts available on multiple keyboard layouts you need to store the virtual key codes reported by the keyboard not the letter reported. There are many people using multiple keyboard shortcuts on their computer and they are switching from one layout to another very often. So you can’t rely on letters reported by OS but you can safely use the virtual key codes reported because these are not changing when the used is changing the layouts. In fact virtual key codes are.
You can find a full list of virtual key codes here.