Fix i18n support in cinder

I checked all the cinder files and found some small issues
of i18n support.So I fix them.

Change-Id: I2df06cb9db4643bd734105664d83299726f7b4e9
Partial-bug: #1574965

Author: Huanxuan Ao

openstackclient/volume/v2/qos_specs.py

@@ -250,8 +250,8 @@ def get_parser(self, prog_name):
             metavar='<key>',
             action='append',
             default=[],
-            help=('Property to remove from the QoS specification. '
-                  '(repeat option to unset multiple properties)'),
+            help=_('Property to remove from the QoS specification. '
+                   '(repeat option to unset multiple properties)'),
         )
         return parser
 

openstackclient/volume/v2/snapshot.py

@@ -37,7 +37,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             "--name",
             metavar="<name>",
-            help=("Name of the snapshot")
+            help=_("Name of the snapshot")
         )
         parser.add_argument(
             "--description",

openstackclient/volume/v2/volume_type.py

@@ -225,8 +225,8 @@ def take_action(self, parsed_args):
                 result += 1
 
         if result > 0:
-            raise exceptions.CommandError("Command Failed: One or more of the"
-                                          " operations failed")
+            raise exceptions.CommandError(_("Command Failed: One or more of"
+                                          " the operations failed"))
 
 
 class ShowVolumeType(command.ShowOne):
@@ -315,5 +315,5 @@ def take_action(self, parsed_args):
                 result += 1
 
         if result > 0:
-            raise exceptions.CommandError("Command Failed: One or more of the"
-                                          " operations failed")
+            raise exceptions.CommandError(_("Command Failed: One or more of"
+                                          " the operations failed"))