Prestashop 1.7.5.2 Translations not working

[Rosi]

I have a smartblog module, and the text translations do not work at all in it. In PHP scripts, neither of these codes works:

class smartblog extends Module {

public $nrl;

public function __construct() {

        $this->nrl = $this->trans('Name is required.', array(), 'Modules.Smartblog.Shop');
        $this->nrl = $this->trans('Name is required.', array(), 'Modules.Smartblog');
        $this->nrl = Context::getContext()->getTranslator()->trans('Name is required.', array(), 'Modules.Smartblog.Shop');
        $this->nrl = Context::getContext()->getTranslator()->trans('Name is required.', array(), 'Modules.Smartblog');

}

}

In tpl. it is not such an issue, as the translations can be exported to an .xlf file.
It is insane to see such number of problems with the Prestashop translation system, it is a complete disaster.

Can you tell me what the problem might be?