- if ( ! empty( $_POST['WPLANG'] ) && wp_can_install_language_pack() ) {
- $language = wp_download_language_pack( wp_unslash( $_POST['WPLANG'] ) );
- if ( $language ) {
- $meta['WPLANG'] = $language;
+ if ( isset( $_POST['WPLANG'] ) ) {
+ if ( '' === $_POST['WPLANG'] ) {
+ $meta['WPLANG'] = ''; // en_US
+ } elseif ( wp_can_install_language_pack() ) {
+ $language = wp_download_language_pack( wp_unslash( $_POST['WPLANG'] ) );
+ if ( $language ) {
+ $meta['WPLANG'] = $language;
+ }