Prosiek on "Polylang + Artisteer, bug in navmenus.php"

I need help with changing php code on my page.
I don't know php, so I would very much appreciate if you could tell me what the broken code should look like, because I do not know, waht to delete, what to keep :(

// remove current-menu and current-menu-ancestor classes to lang switcher when not on the home page
	function wp_nav_menu_objects($items) {
		$r_ids = $k_ids = array();

		foreach ($items as $item) {
			if (in_array('current-lang', $item->classes)) {
				$item->classes = array_diff($item->classes, array('current-menu-item'));
				$r_ids = array_merge($r_ids, $this->get_ancestors($item)); // remove the classes for these ancestors
			}
			elseif (in_array('current-menu-item', $item->classes))
				$k_ids = array_merge($k_ids, $this->get_ancestors($item)); // keep the classes for these ancestors

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Please help and show me the correct code, I should insert in my nav-menu.php file.
Thanks!