Source

File: wp-includes/customize/class-wp-customize-nav-menu-item-setting.php

protected function get_original_title( $item ) {
		$original_title = '';
		if ( 'post_type' === $item->type && ! empty( $item->object_id ) ) {
			$original_object = get_post( $item->object_id );
			if ( $original_object ) {
				/** This filter is documented in wp-includes/post-template.php */
				$original_title = apply_filters( 'the_title', $original_object->post_title, $original_object->ID );

				if ( '' === $original_title ) {
					/* translators: %d: ID of a post. */
					$original_title = sprintf( __( '#%d (no title)' ), $original_object->ID );
				}
			}
		} elseif ( 'taxonomy' === $item->type && ! empty( $item->object_id ) ) {
			$original_term_title = get_term_field( 'name', $item->object_id, $item->object, 'raw' );
			if ( ! is_wp_error( $original_term_title ) ) {
				$original_title = $original_term_title;
			}
		} elseif ( 'post_type_archive' === $item->type ) {
			$original_object = get_post_type_object( $item->object );
			if ( $original_object ) {
				$original_title = $original_object->labels->archives;
			}
		}
		$original_title = html_entity_decode( $original_title, ENT_QUOTES, get_bloginfo( 'charset' ) );
		return $original_title;
	}