Index: src/wp-admin/about.php
===================================================================
--- src/wp-admin/about.php	(revision 38244)
+++ src/wp-admin/about.php	(working copy)
@@ -34,10 +34,10 @@
 }
 
 $video_url = 'https://videopress.com/embed/scFdjVo6?hd=true';
-$locale    = str_replace( '_', '-', get_locale() );
-list( $locale ) = explode( '-', $locale );
+$video_locale = str_replace( '_', '-', get_locale() );
+list( $video_locale ) = explode( '-', $video_locale );
 if ( 'en' !== $locale ) {
-	$video_url = add_query_arg( 'defaultLangCode', $locale, $video_url );
+	$video_url = add_query_arg( 'defaultLangCode', $video_locale, $video_url );
 }
 
 $title = __( 'About' );
@@ -180,7 +180,13 @@
 			<div class="under-the-hood two-col">
 				<div class="col">
 					<h3><?php _e( 'Customizer APIs for Setting Validation and Notifications' ); ?></h3>
-					<p><?php _e( 'Settings now have an <a href="https://make.wordpress.org/core/2016/07/05/customizer-apis-in-4-6-for-setting-validation-and-notifications/">API for enforcing validation constraints</a>. Likewise Customizer controls now support notifications which are used to display validation errors instead of failing silently.' ); ?></p>
+					<p><?php
+						if ( 'en_US' === get_locale() ) {
+							echo 'Settings now have an <a href="https://make.wordpress.org/core/2016/07/05/customizer-apis-in-4-6-for-setting-validation-and-notifications/">API for enforcing validation constraints</a>. Likewise, Customizer controls now support notifications, which are used to display validation errors instead of failing silently.';
+						} else {
+							_e( 'Settings now have an <a href="https://make.wordpress.org/core/2016/07/05/customizer-apis-in-4-6-for-setting-validation-and-notifications/">API for enforcing validation constraints</a>. Likewise Customizer controls now support notifications which are used to display validation errors instead of failing silently.' );
+						}
+					?></p>
 				</div>
 				<div class="col">
 					<h3><?php _e( 'Multisite, now faster than ever' ); ?></h3>