gettext: fix ngettext usage
_() should not be used in conjunction with ngettext(), otherwise it's impossible to properly translate the message into languages that have multiple plural forms, such as Czech. Additionally, spice-gtk must use dngettext instead of ngettext, otherwise the translation strings are searched within a wrong domain. Fix ngettext usage in usb-device-widget.c and update the PO files accordingly. Signed-off-by:Jakub Janků <jjanku@redhat.com> Acked-by:
Frediano Ziglio <fziglio@redhat.com>