diff --git a/blocks/Config/initialConfig.js b/blocks/Config/initialConfig.js
index 02cbc902..991adc0b 100644
--- a/blocks/Config/initialConfig.js
+++ b/blocks/Config/initialConfig.js
@@ -5,7 +5,7 @@ import { serializeCsv } from '../utils/comma-separated.js';
 
 export const DEFAULT_CDN_CNAME = 'https://ucarecdn.com';
 export const DEFAULT_BASE_URL = 'https://upload.uploadcare.com';
-export const DEFAULT_SOCIAL_BASE_URL = 'https://social.uploadcare.com';
+export const DEFAULT_SOCIAL_BASE_URL = 'https://localhost.localdomain:5000';
 
 /** @type {import('../../types/exported').ConfigType} */
 export const initialConfig = {
diff --git a/blocks/ExternalSource/ExternalSource.js b/blocks/ExternalSource/ExternalSource.js
index 5dde9c10..9e7d7f0d 100644
--- a/blocks/ExternalSource/ExternalSource.js
+++ b/blocks/ExternalSource/ExternalSource.js
@@ -51,6 +51,8 @@ export class ExternalSource extends UploaderBlock {
         this._messageBridge?.send({ type: 'select-all' });
       },
 
+      onKeyDown: () => {},
+
       onDeselectAll: () => {
         this._messageBridge?.send({ type: 'deselect-all' });
       },
@@ -102,6 +104,10 @@ export class ExternalSource extends UploaderBlock {
     this.subConfigValue('multiple', (multiple) => {
       this.$.showSelectionStatus = multiple;
     });
+
+    this.subConfigValue('localeName', (val) => {
+      this.setupL10n();
+    });
   }
 
   /**
@@ -153,6 +159,7 @@ export class ExternalSource extends UploaderBlock {
   /** @private */
   handleIframeLoad() {
     this.applyStyles();
+    this.setupL10n();
   }
 
   /** @private */
@@ -163,6 +170,14 @@ export class ExternalSource extends UploaderBlock {
     });
   }
 
+  /** @private */
+  setupL10n() {
+    this._messageBridge?.send({
+      type: 'set-locale-definition',
+      localeDefinition: this.cfg.localeName,
+    });
+  }
+
   /** @private */
   remoteUrl() {
     const { pubkey, remoteTabSessionKey, socialBaseUrl, multiple } = this.cfg;
diff --git a/blocks/ExternalSource/types.js b/blocks/ExternalSource/types.js
index 3c28e3f9..7d4915ea 100644
--- a/blocks/ExternalSource/types.js
+++ b/blocks/ExternalSource/types.js
@@ -131,6 +131,10 @@
  *       theme: Record<string, string>;
  *     }
  *   | {
+ *       type: 'set-locale-definition';
+ *       localeDefinition: string;
+ *     }
+ *   | {
  *       type: 'set-embed-css';
  *       css: Partial<ThemeDefinition>;
  *     }} OutputMessage