Customizing checkout fields using actions and filters

Hi,
I need to edit WooCommerce checkout fields to change the placeholder text and on focus. This particular field isn’t translated and I don’t know why.

I have tried this code and it works but on placeholder on focus doesn’t:

add_filter( ‘woocommerce_default_address_fields’ , ‘custom_override_default_address_fields’ );

function custom_override_default_address_fields( $address_fields ) {
$address_fields[‘address_2’][‘placeholder’] = ‘Nº de Apartamento/ Andar’;
return $address_fields;
}

Thanks,

Patrícia

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