Ticket #53710: 53710.diff

src/wp-admin/update-core.php

@@ -48 +48 @@
                         // If the only available update is a partial builds, it doesn't need a language-specific version string.
                         $version_string = $update->current;
                 }
+        } elseif ( 'en_US' === $update->locale && 'en_US' !== get_locale() ) {
+                $version_string = sprintf( '%s–%s', $update->current, $update->locale );
         }
 
         $current = false;