conflict with method name

"You either take off the cross or put on your panties."(с)

From a framework perspective, you are defining the same URL mask.
Choose the right way.

PHP Code:

$routes->add('{locale}/blog', 'Main::blog');
// or
$routes->add('it/blog', 'It/Main::blog');
$routes->add('en/blog', 'En/Main::blog');