Validation field label language

PHP Code:

                'site_name'             =>      ['label' => 'App.site_name', 'rules'  =>  'required'],
        ]; 


But still give site_name, not what site_name in App language file.

Hi. Not sure, about user guide. When I had to make a custom language thing in my code I wrote like this:

'site_name'             =>      ['label' => lang('language_file.site_name', [], 'language_folder'), 'rules'  =>  'required'],

This was written in controller, so I'm not sure if it answers your question. But you can try it.

I can not access lang() function in property declarations:

PHP Code:

protected $validationRules      =   [
'site_name'             =>      ['label' => lang('language_file.site_name', [], 'language_folder'), 'rules'  =>  'required'],
];