translate piglatin strings:

    # renpy/common/_layout/classic_joystick_preferences.rpym:94
    old "Joystick Mapping"
    new "Oystickjay Appingmay"

    # renpy/common/_layout/classic_load_save.rpym:138
    old "Empty Slot."
    new "Mptyeay Lotsay."

    # renpy/common/_layout/classic_load_save.rpym:170
    old "a"
    new "aay"

    # renpy/common/_layout/classic_load_save.rpym:179
    old "q"
    new "qay"

    # renpy/common/_compat/gamemenu.rpym:355
    old "Previous"
    new "Reviouspay"

    # renpy/common/_compat/gamemenu.rpym:362
    old "Next"
    new "Extnay"