diff --git a/src/entrypoints/app.js b/src/entrypoints/app.js
index f122b8b3a7..8c4c2cf474 100644
--- a/src/entrypoints/app.js
+++ b/src/entrypoints/app.js
@@ -9,6 +9,8 @@ import { html } from '@polymer/polymer/lib/utils/html-tag.js';
 import { setPassiveTouchGestures } from '@polymer/polymer/lib/utils/settings.js';
 import { PolymerElement } from '@polymer/polymer/polymer-element.js';
 
+import LocalizeMixin from '../mixins/localize-mixin.js';
+
 import {
   ERR_INVALID_AUTH,
   subscribeEntities,
@@ -46,7 +48,7 @@ window.removeInitMsg = function () {
   }
 };
 
-class HomeAssistant extends PolymerElement {
+class HomeAssistant extends LocalizeMixin(PolymerElement) {
   static get template() {
     return html`
     <ha-pref-storage hass="[[hass]]" id="storage"></ha-pref-storage>
@@ -182,23 +184,36 @@ class HomeAssistant extends PolymerElement {
         conn.callService(domain, service, serviceData || {})
           .then(
             () => {
-              var message;
-              var name;
+              let message;
+              let name;
               if (serviceData.entity_id && this.hass.states &&
                 this.hass.states[serviceData.entity_id]) {
                 name = computeStateName(this.hass.states[serviceData.entity_id]);
               }
               if (service === 'turn_on' && serviceData.entity_id) {
-                message = 'Turned on ' + (name || serviceData.entity_id) + '.';
+                message = this.localize(
+                  'ui.notification_toast.entity_turned_on',
+                  'entity', name || serviceData.entity_id
+                );
               } else if (service === 'turn_off' && serviceData.entity_id) {
-                message = 'Turned off ' + (name || serviceData.entity_id) + '.';
+                message = this.localize(
+                  'ui.notification_toast.entity_turned_off',
+                  'entity', name || serviceData.entity_id
+                );
               } else {
-                message = 'Service ' + domain + '/' + service + ' called.';
+                message = this.localize(
+                  'ui.notification_toast.service_called',
+                  'service', `${domain}/${service}`
+                );
               }
               notifications.showNotification(message);
             },
             function () {
-              notifications.showNotification('Failed to call service ' + domain + '/' + service);
+              const msg = this.localize(
+                'ui.notification_toast.service_call_failed',
+                'service', `${domain}/${service}`
+              );
+              notifications.showNotification(msg);
               return Promise.reject();
             }
           ),
diff --git a/src/managers/notification-manager.js b/src/managers/notification-manager.js
index 34245b9922..c55eff9347 100644
--- a/src/managers/notification-manager.js
+++ b/src/managers/notification-manager.js
@@ -2,7 +2,9 @@ import '@polymer/paper-toast/paper-toast.js';
 import { html } from '@polymer/polymer/lib/utils/html-tag.js';
 import { PolymerElement } from '@polymer/polymer/polymer-element.js';
 
-class NotificationManager extends PolymerElement {
+import LocalizeMixin from '../mixins/localize-mixin.js';
+
+class NotificationManager extends LocalizeMixin(PolymerElement) {
   static get template() {
     return html`
     <style>
@@ -12,7 +14,7 @@ class NotificationManager extends PolymerElement {
     </style>
 
     <paper-toast id="toast" text="[[_text]]" no-cancel-on-outside-click="[[_cancelOnOutsideClick]]"></paper-toast>
-    <paper-toast id="connToast" duration="0" text="Connection lost. Reconnecting…" opened="[[connectionLost]]"></paper-toast>
+    <paper-toast id="connToast" duration="0" text="[[localize('ui.notification_toast.connection_lost')]]" opened="[[connectionLost]]"></paper-toast>
 `;
   }
 
diff --git a/src/translations/en.json b/src/translations/en.json
index 3645f4bae8..4be10565e8 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -398,6 +398,13 @@
       "remember": "Remember",
       "log_in": "Log in"
     },
+    "notification_toast": {
+      "entity_turned_on": "Turned on {entity}.",
+      "entity_turned_off": "Turned off {entity}.",
+      "service_called": "Service {service} called.",
+      "service_call_failed": "Failed to call service {service}.",
+      "connection_lost": "Connection lost. Reconnecting…"
+    },
     "sidebar": {
       "developer_tools": "Developer tools",
       "log_out": "Log out"