Add productized reboot menu strings

    <string name="power_off">Power off</string>

    <!-- Button to reboot the phone, within the Phone Options dialog -->

    <string name="reboot_system">Reboot phone</string>

    <string name="reboot_system" product="default">Reboot phone</string>

    <string name="reboot_system" product="tablet">Reboot tablet</string>

    <!-- label for item that screenshots in phone options dialog -->

    <string name="global_action_screenshot">Screenshot</string>