Add the function below to your child theme functions.php file.

// change Sale to Save on the sale badge add_filter( ‘woocommerce_sale_flash’, ‘wc_custom_replace_sale_text’ ); function wc_custom_replace_sale_text( $html ) { return str_replace( __( ‘Sale!’, ‘woocommerce’ ), __( ‘Save!’, ‘woocommerce’ ), $html ); }