i18n: translate labels for NICs

Translate the labels for a NIC, both when a MAC address is available and
when it is not.

Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Pino Toscano <ptoscano@redhat.com>

virtManager/details/details.py

@@ -188,9 +188,9 @@ def _label_for_device(dev):
 
     if devtype == "interface":
         if dev.macaddr:
-            return "NIC %s" % dev.macaddr[-9:]
+            return _("NIC %(mac)s") % {"mac": dev.macaddr[-9:]}
         else:
-            return "NIC"
+            return _("NIC")
 
     if devtype == "input":
         if dev.type == "tablet":