Change CF7 select blank line

cf7-blank.php

// Alterando o texto da blank line do Contact form 7
function my_wpcf7_form_elements($html) {
	$text = 'Selecione o departamento';
	$html = str_replace('<option value="">---</option>', '<option value="">' . $text . '</option>', $html);
	return $html;
}
add_filter('wpcf7_form_elements', 'my_wpcf7_form_elements');