translate message "The email address......"

function my_em_text_rewrites($translation, $orig) {
	switch ($orig) {
		case 'The email address isn’t correct.' :
			$translation = 'The email address should not be empty: ';
			break;
		case '<strong>ERROR</strong>: The email address isn&#8217;t correct.' :
			$translation = '<strong>ERROR</strong>: The email address should not be empty. ';
			break;
	}
	return $translation;
}
add_action ( 'gettext', 'my_em_text_rewrites', 1, 2 );