Ticket #42241: 42241.2.diff

src/wp-includes/script-loader.php

@@ -355 +355 @@
         $scripts->add( 'mediaelement', false, array( 'jquery', 'mediaelement-core', 'mediaelement-migrate' ), '4.2.6-78496d1' );
         $scripts->add( 'mediaelement-core', "/wp-includes/js/mediaelement/mediaelement-and-player$suffix.js", array(), '4.2.6-78496d1', 1 );
         $scripts->add( 'mediaelement-migrate', "/wp-includes/js/mediaelement/mediaelement-migrate$suffix.js", array(), false, 1);
+        $mejs_language = strtolower( str_replace( '_', '-', is_admin() ? get_user_locale() : get_locale() ) );
+        if ( $mejs_language !== 'zh-cn' ) { // The only locale with a country code currently.
+                $mejs_language = strtok( $mejs_language, '-' );
+        }
+
         did_action( 'init' ) && $scripts->localize( 'mediaelement', 'mejsL10n', array(
-                'language' => get_bloginfo( 'language' ),
+                'language' => $mejs_language,
                 'strings'  => array(
                         'mejs.install-flash'       => __( 'You are using a browser that does not have Flash player enabled or installed. Please turn on your Flash player plugin or download the latest version from https://get.adobe.com/flashplayer/' ),
                         'mejs.fullscreen-off'      => __( 'Turn off Fullscreen' ),