Fix button preference, add another right stick setting

No reason for the bool version, and it was still being used in the code.  Caused weirdness.

Added the control style used in Valkyria Chronicles / Senjou no Valkyria as well.  I don't know if other games use it, but it's a simple layout.  Could be configurable later.  I also made it work for Z axis/rotation on DirectInput (which is what my current controller maps the right stick to, and iirc what my previous ones have as well.)

Adds new i18n strings:
 * Button Preference - O to Confirm
 * Button Preference - X to Confirm

Removes i18n strings:
 * Button Preference
 * (O to Enter and X to Enter were not translatable.)

-[Unknown]