diff --git a/src/wp-includes/abilities.php b/src/wp-includes/abilities.php
index 4c6db1ed830e0..267bc118217e6 100644
--- a/src/wp-includes/abilities.php
+++ b/src/wp-includes/abilities.php
@@ -111,7 +111,12 @@ function wp_register_core_abilities(): void {
 
 				$result = array();
 				foreach ( $requested_fields as $field ) {
-					$result[ $field ] = get_bloginfo( $field );
+					if ( 'language' === $field ) {
+						$wplang = get_option( 'WPLANG' );
+						$result[ $field ] = str_replace( '_', '-', $wplang ? $wplang : 'en_US' );
+					} else {
+						$result[ $field ] = get_bloginfo( $field );
+					}
 				}
 
 				return $result;