diff --git a/neutron/agent/common/ovs_lib.py b/neutron/agent/common/ovs_lib.py
index 1926fbb3238..caccdb52183 100644
--- a/neutron/agent/common/ovs_lib.py
+++ b/neutron/agent/common/ovs_lib.py
@@ -207,9 +207,10 @@ OF_PROTOCOL_TO_VERSION = {
 
 def version_from_protocol(protocol):
     if protocol not in OF_PROTOCOL_TO_VERSION:
-        raise Exception("unknown OVS protocol string, cannot compare: %s, "
-                        "(known: %s)" % (protocol,
-                                         list(OF_PROTOCOL_TO_VERSION)))
+        raise Exception(_("unknown OVS protocol string, cannot compare: "
+                          "%(protocol)s, (known: %(known)s)") %
+                        {'protocol': protocol,
+                         'known': list(OF_PROTOCOL_TO_VERSION)})
     return OF_PROTOCOL_TO_VERSION[protocol]
 
 
@@ -395,7 +396,7 @@ class OVSBridge(BaseOVS):
             # broken here
             LOG.exception("Timed out retrieving datapath_id on bridge %s.",
                           self.br_name)
-            raise RuntimeError('No datapath_id on bridge %s' % self.br_name)
+            raise RuntimeError(_('No datapath_id on bridge %s') % self.br_name)
 
     def do_action_flows(self, action, kwargs_list, use_bundle=False):
         # we can't mix strict and non-strict, so we'll use the first kw
@@ -409,8 +410,8 @@ class OVSBridge(BaseOVS):
                     # cookie to match flows whatever their cookie is
                     kw.pop('cookie')
                     if kw.get('cookie_mask'):  # non-zero cookie mask
-                        raise Exception("cookie=COOKIE_ANY but cookie_mask "
-                                        "set to %s" % kw.get('cookie_mask'))
+                        raise Exception(_("cookie=COOKIE_ANY but cookie_mask "
+                                          "set to %s") % kw.get('cookie_mask'))
                 elif 'cookie' in kw:
                     # a cookie was specified, use it
                     kw['cookie'] = check_cookie_mask(kw['cookie'])
diff --git a/neutron/agent/l3/item_allocator.py b/neutron/agent/l3/item_allocator.py
index ed14ede6c47..3689f541a2d 100644
--- a/neutron/agent/l3/item_allocator.py
+++ b/neutron/agent/l3/item_allocator.py
@@ -16,6 +16,7 @@ import os
 
 from oslo_log import log as logging
 
+from neutron._i18n import _
 
 LOG = logging.getLogger(__name__)
 
@@ -104,9 +105,10 @@ class ItemAllocator(object):
                 # The number of address pairs allocated from the
                 # pool depends upon the prefix length specified
                 # in DVR_FIP_LL_CIDR
-                raise RuntimeError("Cannot allocate item of type:"
-                                   " %s from pool using file %s"
-                                   % (self.ItemClass, self.state_file))
+                raise RuntimeError(_("Cannot allocate item of type: "
+                                     "%(class)s from pool using file %(file)s")
+                                   % {'class': self.ItemClass,
+                                      'file': self.state_file})
 
         self.allocations[key] = self.pool.pop()
         self._write_allocations()
diff --git a/neutron/agent/linux/openvswitch_firewall/firewall.py b/neutron/agent/linux/openvswitch_firewall/firewall.py
index a3c65db79c9..81aeb6021f8 100644
--- a/neutron/agent/linux/openvswitch_firewall/firewall.py
+++ b/neutron/agent/linux/openvswitch_firewall/firewall.py
@@ -22,6 +22,7 @@ from neutron_lib import constants as lib_const
 from oslo_log import log as logging
 from oslo_utils import netutils
 
+from neutron._i18n import _
 from neutron.agent import firewall
 from neutron.agent.linux.openvswitch_firewall import constants as ovsfw_consts
 from neutron.agent.linux.openvswitch_firewall import exceptions
@@ -239,9 +240,9 @@ class ConjIdMap(object):
         """
         if direction not in [lib_const.EGRESS_DIRECTION,
                              lib_const.INGRESS_DIRECTION]:
-            raise ValueError("Invalid direction '%s'" % direction)
+            raise ValueError(_("Invalid direction '%s'") % direction)
         if ethertype not in [lib_const.IPv4, lib_const.IPv6]:
-            raise ValueError("Invalid ethertype '%s'" % ethertype)
+            raise ValueError(_("Invalid ethertype '%s'") % ethertype)
 
         return self.id_map[(sg_id, remote_sg_id, direction, ethertype)]
 
diff --git a/neutron/agent/linux/openvswitch_firewall/rules.py b/neutron/agent/linux/openvswitch_firewall/rules.py
index 7d93e371b49..c23c9ea0c80 100644
--- a/neutron/agent/linux/openvswitch_firewall/rules.py
+++ b/neutron/agent/linux/openvswitch_firewall/rules.py
@@ -18,6 +18,7 @@ import collections
 import netaddr
 from neutron_lib import constants as n_consts
 
+from neutron._i18n import _
 from neutron.agent.linux.openvswitch_firewall import constants as ovsfw_consts
 from neutron.common import utils
 from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants \
@@ -59,8 +60,8 @@ def _assert_mergeable_rules(rule_conj_list):
         rule1.pop('port_range_max', None)
         if rule_tmpl != rule1:
             raise RuntimeError(
-                "Incompatible SG rules detected: %(rule1)s and %(rule2)s. "
-                "They cannot be merged. This should not happen." %
+                _("Incompatible SG rules detected: %(rule1)s and %(rule2)s. "
+                  "They cannot be merged. This should not happen.") %
                 {'rule1': rule_tmpl, 'rule2': rule})
 
 
diff --git a/neutron/agent/resource_cache.py b/neutron/agent/resource_cache.py
index 1e90ad14c22..0d333d59bc7 100644
--- a/neutron/agent/resource_cache.py
+++ b/neutron/agent/resource_cache.py
@@ -17,6 +17,7 @@ from neutron_lib.callbacks import registry
 from neutron_lib import context as n_ctx
 from oslo_log import log as logging
 
+from neutron._i18n import _
 from neutron.api.rpc.callbacks.consumer import registry as registry_rpc
 from neutron.api.rpc.callbacks import events as events_rpc
 from neutron.api.rpc.handlers import resources_rpc
@@ -42,7 +43,7 @@ class RemoteResourceCache(object):
 
     def _type_cache(self, rtype):
         if rtype not in self.resource_types:
-            raise RuntimeError("Resource cache not tracking %s" % rtype)
+            raise RuntimeError(_("Resource cache not tracking %s") % rtype)
         return self._cache_by_type_and_id[rtype]
 
     def start_watcher(self):
diff --git a/neutron/common/_deprecate.py b/neutron/common/_deprecate.py
index 3c9a291497f..18c66f507f8 100644
--- a/neutron/common/_deprecate.py
+++ b/neutron/common/_deprecate.py
@@ -158,8 +158,8 @@ def _moved_global(old_name, new_module=None, new_name=None):
 
     """
     if not (new_module or new_name):
-        raise AssertionError("'new_module' and 'new_name' "
-                             "must not be both None")
+        raise AssertionError(_("'new_module' and 'new_name' "
+                               "must not be both None"))
     if isinstance(new_module, _MovedGlobals):
         # The new module has been shimmed, get the original
         new_module = new_module._mg__old_ref
diff --git a/neutron/common/utils.py b/neutron/common/utils.py
index ce6cd5f0da1..8d8654072f4 100644
--- a/neutron/common/utils.py
+++ b/neutron/common/utils.py
@@ -643,7 +643,7 @@ def wait_until_true(predicate, timeout=60, sleep=1, exception=None):
         if exception is not None:
             # pylint: disable=raising-bad-type
             raise exception
-        raise WaitTimeout("Timed out after %d seconds" % timeout)
+        raise WaitTimeout(_("Timed out after %d seconds") % timeout)
 
 
 class _AuthenticBase(object):
diff --git a/neutron/db/migration/autogen.py b/neutron/db/migration/autogen.py
index 5ba6adf83a0..3bab22c01e5 100644
--- a/neutron/db/migration/autogen.py
+++ b/neutron/db/migration/autogen.py
@@ -16,6 +16,7 @@ from alembic.operations import ops
 from alembic.util import Dispatcher
 from alembic.util import rev_id as new_rev_id
 
+from neutron._i18n import _
 from neutron.db.migration import cli
 
 _ec_dispatcher = Dispatcher()
@@ -107,8 +108,8 @@ def _alter_column(context, directive, phase):
         return directive
     else:
         raise NotImplementedError(
-            "Don't know if operation is an expand or "
-            "contract at the moment: %s" % directive)
+            _("Don't know if operation is an expand or "
+              "contract at the moment: %s") % directive)
 
 
 @_ec_dispatcher.dispatch_for(ops.ModifyTableOps)
diff --git a/neutron/db/provisioning_blocks.py b/neutron/db/provisioning_blocks.py
index 58ec3afef5f..4494183b0c0 100644
--- a/neutron/db/provisioning_blocks.py
+++ b/neutron/db/provisioning_blocks.py
@@ -18,6 +18,7 @@ from neutron_lib.callbacks import resources
 from neutron_lib.db import api as db_api
 from oslo_log import log as logging
 
+from neutron._i18n import _
 from neutron.db import models_v2
 from neutron.objects import provisioning_blocks as pb_obj
 
@@ -121,7 +122,7 @@ def provisioning_complete(context, object_id, object_type, entity):
     # this can't be called in a transaction to avoid REPEATABLE READ
     # tricking us into thinking there are remaining provisioning components
     if context.session.is_active:
-        raise RuntimeError("Must not be called in a transaction")
+        raise RuntimeError(_("Must not be called in a transaction"))
     standard_attr_id = _get_standard_attr_id(context, object_id,
                                              object_type)
     if not standard_attr_id:
@@ -161,10 +162,10 @@ def is_object_blocked(context, object_id, object_type):
 def _get_standard_attr_id(context, object_id, object_type):
     model = _RESOURCE_TO_MODEL_MAP.get(object_type)
     if not model:
-        raise RuntimeError("Could not find model for %s. If you are "
-                           "adding provisioning blocks for a new resource "
-                           "you must call add_model_for_resource during "
-                           "initialization for your type." % object_type)
+        raise RuntimeError(_("Could not find model for %s. If you are "
+                             "adding provisioning blocks for a new resource "
+                             "you must call add_model_for_resource during "
+                             "initialization for your type.") % object_type)
     obj = (context.session.query(model.standard_attr_id).
            enable_eagerloads(False).
            filter_by(id=object_id).first())
diff --git a/neutron/db/standard_attr.py b/neutron/db/standard_attr.py
index 6f0475d3f78..3fe7003c876 100644
--- a/neutron/db/standard_attr.py
+++ b/neutron/db/standard_attr.py
@@ -96,7 +96,7 @@ class HasStandardAttributes(object):
         # with the declarative base others inherit from.
         if hasattr(cls, 'api_collections'):
             return cls.api_collections
-        raise NotImplementedError("%s must define api_collections" % cls)
+        raise NotImplementedError(_("%s must define api_collections") % cls)
 
     @classmethod
     def get_api_sub_resources(cls):
@@ -119,8 +119,8 @@ class HasStandardAttributes(object):
         try:
             return cls.collection_resource_map
         except AttributeError:
-            raise NotImplementedError("%s must define "
-                                      "collection_resource_map" % cls)
+            raise NotImplementedError(_("%s must define "
+                                        "collection_resource_map") % cls)
 
     @classmethod
     def validate_tag_support(cls):
@@ -191,8 +191,9 @@ class HasStandardAttributes(object):
 
 def _resource_model_map_helper(rs_map, resource, subclass):
     if resource in rs_map:
-        raise RuntimeError("Model %(sub)s tried to register for API resource "
-                           "%(res)s which conflicts with model %(other)s." %
+        raise RuntimeError(_("Model %(sub)s tried to register for API "
+                             "resource %(res)s which conflicts with model "
+                             "%(other)s.") %
                            dict(sub=subclass,
                                 other=rs_map[resource],
                                 res=resource))
@@ -231,8 +232,8 @@ def get_tag_resource_parent_map():
 @event.listens_for(se.Session, 'after_bulk_delete')
 def throw_exception_on_bulk_delete_of_listened_for_objects(delete_context):
     if hasattr(delete_context.mapper.class_, 'revises_on_change'):
-        raise RuntimeError("%s may not be deleted in bulk because it "
-                           "bumps the revision of other resources via "
-                           "SQLAlchemy event handlers, which are not "
-                           "compatible with bulk deletes." %
+        raise RuntimeError(_("%s may not be deleted in bulk because it "
+                             "bumps the revision of other resources via "
+                             "SQLAlchemy event handlers, which are not "
+                             "compatible with bulk deletes.") %
                            delete_context.mapper.class_)
diff --git a/neutron/pecan_wsgi/controllers/root.py b/neutron/pecan_wsgi/controllers/root.py
index 168cd751d88..1ab8fbbc067 100644
--- a/neutron/pecan_wsgi/controllers/root.py
+++ b/neutron/pecan_wsgi/controllers/root.py
@@ -24,6 +24,7 @@ import pecan
 from pecan import request
 from six.moves import urllib
 
+from neutron._i18n import _
 from neutron.api.views import versions as versions_view
 from neutron import manager
 from neutron.pecan_wsgi.controllers import extensions as ext_ctrl
@@ -43,8 +44,8 @@ _CORE_RESOURCES = {net_def.RESOURCE_NAME: net_def.COLLECTION_NAME,
 
 def _load_version_info(version_info):
     if version_info['id'] in _VERSION_INFO:
-        raise AssertionError("ID %s must not be in "
-                             "VERSION_INFO" % version_info['id'])
+        raise AssertionError(_("ID %s must not be in "
+                               "VERSION_INFO") % version_info['id'])
     _VERSION_INFO[version_info['id']] = version_info
 
 
diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py
index cdb539f7701..00d33377439 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py
@@ -130,7 +130,8 @@ class OpenFlowSwitchMixin(object):
         if cookie == ovs_lib.COOKIE_ANY:
             cookie = 0
             if cookie_mask != 0:
-                raise Exception("cookie=COOKIE_ANY but cookie_mask set to %s" %
+                raise Exception(_("cookie=COOKIE_ANY but cookie_mask set to "
+                                  "%s") %
                                 cookie_mask)
         elif cookie == COOKIE_DEFAULT:
             cookie = self._default_cookie
@@ -266,8 +267,8 @@ class BundledOpenFlowBridge(object):
                 return under
             return functools.partial(under, active_bundle=dict(
                 id=self.active_bundle, bundle_flags=self.bundle_flags))
-        raise AttributeError("Only install_* or uninstall_* methods "
-            "can be used")
+        raise AttributeError(_("Only install_* or uninstall_* methods "
+                               "can be used"))
 
     def __enter__(self):
         if self.active_bundle is not None:
@@ -285,7 +286,7 @@ class BundledOpenFlowBridge(object):
             reply = self.br._send_msg(msg, reply_cls=ofpp.ONFBundleCtrlMsg)
             if reply.type != ofp.ONF_BCT_OPEN_REPLY:
                 raise RuntimeError(
-                    "Unexpected reply type %d != ONF_BCT_OPEN_REPLY" %
+                    _("Unexpected reply type %d != ONF_BCT_OPEN_REPLY") %
                     reply.type)
             return self
         except Exception:
@@ -313,7 +314,7 @@ class BundledOpenFlowBridge(object):
             if reply.type != expected_reply:
                 # The bundle ID may be in a bad state.  Let's leave it
                 # in active_bundles so that we will never use it again.
-                raise RuntimeError("Unexpected reply type %d" % reply.type)
+                raise RuntimeError(_("Unexpected reply type %d") % reply.type)
             self.br.active_bundles.remove(self.active_bundle)
         finally:
             # It is possible the bundle is kept open, but this must be
diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py
index f639cd47f66..56a17f6352e 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py
@@ -17,6 +17,7 @@
 from oslo_log import log as logging
 from oslo_utils import excutils
 
+from neutron._i18n import _
 from neutron.agent.common import ovs_lib
 from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants \
         as ovs_consts
@@ -46,7 +47,7 @@ class OVSAgentBridge(ofswitch.OpenFlowSwitchMixin,
                 LOG.info("Bridge %(br_name)s has datapath-ID %(dpid)s",
                          {"br_name": self.br_name, "dpid": dpid})
                 if dpid is None:
-                    raise RuntimeError("Unknown datapath id.")
+                    raise RuntimeError(_("Unknown datapath id."))
                 self._cached_dpid = int(dpid, 16)
             try:
                 dp = self._get_dp_by_dpid(self._cached_dpid)
diff --git a/neutron/plugins/ml2/ovo_rpc.py b/neutron/plugins/ml2/ovo_rpc.py
index 6d2c47f637c..e13ed590726 100644
--- a/neutron/plugins/ml2/ovo_rpc.py
+++ b/neutron/plugins/ml2/ovo_rpc.py
@@ -23,6 +23,7 @@ from neutron_lib import context as n_ctx
 from oslo_concurrency import lockutils
 from oslo_log import log as logging
 
+from neutron._i18n import _
 from neutron.api.rpc.callbacks import events as rpc_events
 from neutron.api.rpc.handlers import resources_rpc
 from neutron.db import api as db_api
@@ -123,7 +124,7 @@ class _ObjectChangeHandler(object):
             return callback_kwargs[id_kwarg]
         if self._resource in callback_kwargs:
             return callback_kwargs[self._resource]['id']
-        raise RuntimeError("Couldn't find resource ID in callback event")
+        raise RuntimeError(_("Couldn't find resource ID in callback event"))
 
 
 class OVOServerRpcInterface(object):
diff --git a/neutron/quota/resource.py b/neutron/quota/resource.py
index f09eefe7eee..42dd5de5109 100644
--- a/neutron/quota/resource.py
+++ b/neutron/quota/resource.py
@@ -21,6 +21,7 @@ from oslo_utils import excutils
 from sqlalchemy import exc as sql_exc
 from sqlalchemy.orm import session as se
 
+from neutron._i18n import _
 from neutron.db import api as db_api
 from neutron.db.quota import api as quota_api
 
@@ -52,7 +53,7 @@ def _count_resource(context, collection_name, tenant_id):
             except (NotImplementedError, AttributeError):
                 pass
     raise NotImplementedError(
-        'No plugins that support counting %s found.' % collection_name)
+        _('No plugins that support counting %s found.') % collection_name)
 
 
 class BaseResource(object):
@@ -314,10 +315,10 @@ class TrackedResource(BaseResource):
 
     def _except_bulk_delete(self, delete_context):
         if delete_context.mapper.class_ == self._model_class:
-            raise RuntimeError("%s may not be deleted in bulk because "
-                               "it is tracked by the quota engine via "
-                               "SQLAlchemy event handlers, which are not "
-                               "compatible with bulk deletes." %
+            raise RuntimeError(_("%s may not be deleted in bulk because "
+                                 "it is tracked by the quota engine via "
+                                 "SQLAlchemy event handlers, which are not "
+                                 "compatible with bulk deletes.") %
                                self._model_class)
 
     def register_events(self):
diff --git a/tox.ini b/tox.ini
index 9621a6274ec..5e4a5180700 100644
--- a/tox.ini
+++ b/tox.ini
@@ -157,12 +157,10 @@ commands = sphinx-build -W -b linkcheck doc/source doc/build/linkcheck
 # E128 continuation line under-indented for visual indent
 # H405 multi line docstring summary not separated with an empty line
 # N530 direct neutron imports not allowed
-# TODO(ihrachys) figure out what to do with N534
-# N534 Untranslated exception message
 # TODO(amotoki) check the following new rules should be fixed or ignored
 # E731 do not assign a lambda expression, use a def
 # W504 line break after binary operator
-ignore = E125,E126,E128,E731,H405,N530,N534,W504
+ignore = E125,E126,E128,E731,H405,N530,W504
 # H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 # H204: Use assert(Not)Equal to check for equality