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Tips on Customizing Sublanguage

How to Hide Sublanguage Admin Menus

function plt_hide_sublanguage_menus() {
	//Hide "Posts → Language Options".
	remove_submenu_page('edit.php', 'post_language_option');
	//Hide "Pages → Language Options".
	remove_submenu_page('edit.php?post_type=page', 'page_language_option');
	//Hide "Settings → Sublanguage".
	remove_submenu_page('options-general.php', 'sublanguage-settings');

	//Hide "Languages".
	remove_menu_page('edit.php?post_type=language');
	//Hide "Languages → Languages".
	remove_submenu_page('edit.php?post_type=language', 'edit.php?post_type=language');
	//Hide "Languages → Add language".
	remove_submenu_page('edit.php?post_type=language', 'post-new.php?post_type=language');
}

add_action('admin_menu', 'plt_hide_sublanguage_menus', 11);

Where do I put this code?

How to Hide the "Language" Meta Box

function plt_hide_sublanguage_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Language" meta box.
	remove_meta_box('language_menu', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_sublanguage_metaboxes', 20);