Trivial: Fix an omited i18n issue

Change-Id: I064ae79d31f96021dfb5d7cd16a3ace9725803f6

Author: Tang Chen

openstackclient/network/v2/port.py

@@ -249,7 +249,8 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'name',
             metavar='<name>',
-            help='Name of this port')
+            help=_("Name of this port")
+        )
         # TODO(singhj): Add support for extended options:
         # qos,security groups,dhcp, address pairs
         return parser