Breadcrumbs

uses:

use filamentv\widgets\Breadcrumbs\Breadcrumbs;

$breadcrumbs ]); ?>

LangSwitch

uses:

use filamentv\widgets\LangSwitch\LangSwitch;

Instalation

composer.phar require "filamentv/yii2-widget":"dev-master"

or add to composer.json into 'require' seaction

"filamentv/yii2-widget":"dev-master"