change message in Search widget

dear support,

I would like to change the message included in the seach button as it is in English.
I see that the file searchform.php exists but can I add custom css (if yes what is it?) instead of modify the php file and put into child theme. If i had to do this, it is correct to add before
‘<?php
// Exit if accessed directly
if ( !defined( ‘ABSPATH’ ) ) exit;

// BEGIN ENQUEUE PARENT ACTION
// AUTO GENERATED – Do not modify or remove comment markers above or below:

if ( !function_exists( ‘chld_thm_cfg_parent_css’ ) ):
function chld_thm_cfg_parent_css() {
wp_enqueue_style( ‘chld_thm_cfg_parent’, trailingslashit( get_template_directory_uri() ) . ‘style.css’ );
}
endif;
add_action( ‘wp_enqueue_scripts’, ‘chld_thm_cfg_parent_css’ );

// END ENQUEUE PARENT ACTION
‘

thank you very much