Update CHANGELOG.md and README.md to cover the 0.18.1 release.

Author: Bob Potterveld

CHANGELOG.md

@@ -4,12 +4,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [0.18.1] - 2021-05-28
+## [0.18.1] - 2021-06-01
 - Change package.json revision to 0.18.1
 - Update aws sdk to current revision  
 - Change codebuild-deploy.yaml to use amazon linux image vs nodejs10 image.
 - Change codebuild-deploy.yaml and pipeline.yaml buildspec and codebuild role to invalidate cloudfront distribution after syncing s3 bucket
-- Fix Lex v2 client state mapping - specific for audio
+- Fix Lex V2 client state mapping - specific for audio
+- Enhance Lex V2 support to
+  - allow configuration of multiple V2 locale ids via template in comma separated list
+  - provide menu based selection of configured V2 locales  
 - Enhance postMessage to better filter messages between iframe and parent
 - Make CognitoAppUserPoolClientId and CognitoUserPoolId optional in master-pipeline.yaml
 ## [0.18.0] - 2021-04-21

README.md

@@ -18,6 +18,21 @@ and ability to interrupt responses and replay recordings
 - Ability to programmatically configure and interact with the chatbot
 UI using JavaScript
 
+#### Notable changes in version 0.18.1
+The Lex Web Ui now supports configuration of multiple Lex V2 Bot Locale IDs
+using a comma separated list in the parameter LexV2BotLocaleId. The default Locale ID 
+is en_US. Other supported values are de_DE, en_AU, en_GB, es_419, es_ES, es_US, fr_CA, 
+fr_FR, it_IT, and ja_JP. See "https://docs.aws.amazon.com/lexv2/latest/dg/lex2.0.pdf" 
+for the current list of supported Locale IDs. 
+
+When multiple Locale IDs are specified in LexV2BotLocaleId, the Lex Web UI toolbar menu 
+will allow the user to select the locale to use. The user selected locale ID is 
+preserved across page refreshes. The locale selection menu items will be disabled if 
+the user is the middle of completing an intent as the locale ID can't be changed at this 
+time. The selected locale ID will be displayed in the toolbar. 
+
+For a complete list of fixes/changes in this version see CHANGELOG.md.
+
 #### Fixes/changes in version 0.18.0
 - Move from webpack V3 to webpack V4 in the lex-web-ui component.
 - Move to npm version 7.10.0.