Consistent keyboard shortcuts behavior on +translate page

This is a follow up for bug 359180:

Right now we are using Shift+Alt+KEY.

Here is the list of outstanding issues regarding keyboard shortcuts:
 * the overlapping of „Shift+Alt” with Windows XP (at least) change keyboard layout
 * the overlapping of „Shift+Alt” with Firefox menu accelerators and depends on the internationalization

Another option is to use Ctrl+KEY as browsers will first call YUI3 events. This will guarantee that YUI3 events are always called, but has a major drawback of messing with users keybindings. Also IE7 will not allow to overwrite Ctrl+P, Ctrl+F and Ctrl+O.

As a workaround, we can add a dummy <a acceskey=KEY> for _each_ keybinding implemented using YUI3. In this case Firefox will not pop up the menu and will call the YUI3 event for SHIFT+ALT+Key.

Talking with Michael Nelson, he favors the dummy <a acceskey=KEY> solutions but suggested to raise this issue on the dev list.