Please update constructor of your widgets to support WordPress 4.3

Here is code of new ctor

public function __construct() {
		$widget_ops = array('classname' => 'qtranxs_widget', 'description' => __('Allows your visitors to choose a Language.', 'qtranslate') );
		parent::__construct('qtranslate', __('qTranslate Language Chooser', 'qtranslate'), $widget_ops);
	}

https://wordpress.org/plugins/qtranslate-x/