[Plugin: Nice Search] changing "search"

I’m having the same request as Martin here: http://wordpress.org/support/topic/customise-the-search_base-prefix-?replies=9

I’m using the following code:

function cws_nice_search_redirect() {
	if ( is_search() && strpos( $_SERVER['REQUEST_URI'], '/wp-admin/' ) === false && strpos( $_SERVER['REQUEST_URI'], '/search/' ) === false ) {
		wp_redirect( home_url( '/search/' . str_replace( array( ' ', '%20' ),  array( '+', '+' ), get_query_var( 's' ) ) .'/' ) );
		exit();
	}
}
add_action( 'template_redirect', 'cws_nice_search_redirect' );

in order to have a search permalink which looks like this:
http://www.mysite.com/search/search+term/

I’d like to change the term “search” with the italian term “ricerca” (http://www.mysite.com/ricerca/search+term/) but it doesn’t work.

Any suggestion?

http://wordpress.org/extend/plugins/nice-search/