edeb on "Polylang Menu Buttons not working"

Yes, I found this. I use One Engine Theme with child theme.

/*-----------------------------------------------------------------------------------*/
		/*	Register Menus
		/*-----------------------------------------------------------------------------------*/
		register_nav_menus(
			array(
			'main_nav'=>__('Main Nav'),
			)
		);
		register_nav_menus(
			array(
			'footer_nav'=>__('Footer Nav'),
			)
		);

		$s_labels = array(
			'name'               => _x( 'Sliders', 'post type general name', 'oneengine' ),
			'singular_name'      => _x( 'Slider', 'post type singular name', 'oneengine' ),
			'menu_name'          => _x( 'Sliders', 'admin menu', 'oneengine' ),
			'name_admin_bar'     => _x( 'Slider', 'add new on admin bar', 'oneengine' ),
			'add_new'            => _x( 'Add New', 'Slider', 'oneengine' ),
			'add_new_item'       => __( 'Add New Slider', 'oneengine' ),
			'new_item'           => __( 'New Slider', 'oneengine' ),
			'edit_item'          => __( 'Edit Slider', 'oneengine' ),
			'view_item'          => __( 'View Slider', 'oneengine' ),
			'all_items'          => __( 'All Sliders', 'oneengine' ),
			'search_items'       => __( 'Search Sliders', 'oneengine' ),
			'parent_item_colon'  => __( 'Parent Sliders:', 'oneengine' ),
			'not_found'          => __( 'No Sliders found.', 'oneengine' ),
			'not_found_in_trash' => __( 'No Portfolios found in Trash.', 'oneengine' ),
		);

		$s_args = array(
			'labels'             => $s_labels,
			'public'             => true,
			'publicly_queryable' => true,
			'show_ui'            => true,
			'show_in_menu'       => true,
			'query_var'          => true,
			'rewrite'            => array( 'slug' => 'slider' ),
			'capability_type'    => 'post',
			'has_archive'        => true,
			'hierarchical'       => false,
			'menu_position'      => null,
			'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
		);

		register_post_type( 'slider', $s_args );

		$p_labels = array(
			'name'               => _x( 'Portfolios', 'post type general name', 'oneengine' ),
			'singular_name'      => _x( 'Portfolio', 'post type singular name', 'oneengine' ),
			'menu_name'          => _x( 'Portfolios', 'admin menu', 'oneengine' ),
			'name_admin_bar'     => _x( 'Portfolio', 'add new on admin bar', 'oneengine' ),
			'add_new'            => _x( 'Add New', 'Portfolio', 'oneengine' ),
			'add_new_item'       => __( 'Add New Portfolio', 'oneengine' ),
			'new_item'           => __( 'New Portfolio', 'oneengine' ),
			'edit_item'          => __( 'Edit Portfolio', 'oneengine' ),
			'view_item'          => __( 'View Portfolio', 'oneengine' ),
			'all_items'          => __( 'All Portfolios', 'oneengine' ),
			'search_items'       => __( 'Search Portfolios', 'oneengine' ),
			'parent_item_colon'  => __( 'Parent Portfolios:', 'oneengine' ),
			'not_found'          => __( 'No Portfolios found.', 'oneengine' ),
			'not_found_in_trash' => __( 'No Portfolios found in Trash.', 'oneengine' ),
		);

		$p_args = array(
			'labels'             => $p_labels,
			'public'             => true,
			'publicly_queryable' => true,
			'show_ui'            => true,
			'show_in_menu'       => true,
			'query_var'          => true,
			'rewrite'            => array( 'slug' => 'portfolio' ),
			'capability_type'    => 'post',
			'has_archive'        => true,
			'hierarchical'       => false,
			'menu_position'      => null,
			'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
		);

		register_post_type( 'portfolio', $p_args );

		$test_labels = array(
			'name'               => _x( 'Testimonials', 'post type general name', 'oneengine' ),
			'singular_name'      => _x( 'Testimonial', 'post type singular name', 'oneengine' ),
			'menu_name'          => _x( 'Testimonials', 'admin menu', 'oneengine' ),
			'name_admin_bar'     => _x( 'Testimonial', 'add new on admin bar', 'oneengine' ),
			'add_new'            => _x( 'Add New', 'Testimonial', 'oneengine' ),
			'add_new_item'       => __( 'Add New Testimonial', 'oneengine' ),
			'new_item'           => __( 'New Testimonial', 'oneengine' ),
			'edit_item'          => __( 'Edit Testimonial', 'oneengine' ),
			'view_item'          => __( 'View Testimonial', 'oneengine' ),
			'all_items'          => __( 'All Testimonials', 'oneengine' ),
			'search_items'       => __( 'Search Testimonials', 'oneengine' ),
			'parent_item_colon'  => __( 'Parent Testimonials:', 'oneengine' ),
			'not_found'          => __( 'No Testimonials found.', 'oneengine' ),
			'not_found_in_trash' => __( 'No Testimonials found in Trash.', 'oneengine' ),
		);

		$test_args = array(
			'labels'             => $test_labels,
			'public'             => true,
			'publicly_queryable' => true,
			'show_ui'            => true,
			'show_in_menu'       => true,
			'query_var'          => true,
			'rewrite'            => array( 'slug' => 'testimonial' ),
			'capability_type'    => 'post',
			'has_archive'        => true,
			'hierarchical'       => false,
			'menu_position'      => null,
			'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
		);

		register_post_type( 'testimonial', $test_args );

		$t_labels = array(
			'name'               => _x( 'Teams', 'post type general name', 'oneengine' ),
			'singular_name'      => _x( 'Team', 'post type singular name', 'oneengine' ),
			'menu_name'          => _x( 'Teams', 'admin menu', 'oneengine' ),
			'name_admin_bar'     => _x( 'Team', 'add new on admin bar', 'oneengine' ),
			'add_new'            => _x( 'Add New', 'Team', 'oneengine' ),
			'add_new_item'       => __( 'Add New Team', 'oneengine' ),
			'new_item'           => __( 'New Team', 'oneengine' ),
			'edit_item'          => __( 'Edit Team', 'oneengine' ),
			'view_item'          => __( 'View Team', 'oneengine' ),
			'all_items'          => __( 'All Teams', 'oneengine' ),
			'search_items'       => __( 'Search Teams', 'oneengine' ),
			'parent_item_colon'  => __( 'Parent Teams:', 'oneengine' ),
			'not_found'          => __( 'No Teams found.', 'oneengine' ),
			'not_found_in_trash' => __( 'No Teams found in Trash.', 'oneengine' ),
		);

		$t_args = array(
			'labels'             => $t_labels,
			'public'             => true,
			'publicly_queryable' => true,
			'show_ui'            => true,
			'show_in_menu'       => true,
			'query_var'          => true,
			'rewrite'            => array( 'slug' => 'team' ),
			'capability_type'    => 'post',
			'has_archive'        => true,
			'hierarchical'       => false,
			'menu_position'      => null,
			'supports'           => array( 'title','thumbnail')
		);

		register_post_type( 'team', $t_args );

		$tax_labels = array(
			'name'              => _x( 'Categories', 'taxonomy general name' ),
			'singular_name'     => _x( 'Category', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Categories', 'oneengine' ),
			'all_items'         => __( 'All Categories', 'oneengine' ),
			'parent_item'       => __( 'Parent Category', 'oneengine' ),
			'parent_item_colon' => __( 'Parent Category:', 'oneengine' ),
			'edit_item'         => __( 'Edit Category', 'oneengine' ),
			'update_item'       => __( 'Update Category', 'oneengine' ),
			'add_new_item'      => __( 'Add New Category', 'oneengine' ),
			'new_item_name'     => __( 'New Category Name', 'oneengine' ),
			'menu_name'         => __( 'Category', 'oneengine' ),
		);

		$tax_args = array(
			'hierarchical'      => true,
			'labels'            => $tax_labels,
			'show_ui'           => true,
			'show_admin_column' => true,
			'query_var'         => true,
			'rewrite'           => array( 'slug' => 'portfolio-cat' ),
		);

		register_taxonomy( 'portfolio_cat', array( 'portfolio' ), $tax_args );

Many thanks.