added locales method

[ahmetbarut]

Newly added method: locales returns all locales used by a model so it's easier to check what translations are there.

    $model->setTranslation('name', 'en', 'testValue_en');
    $model->setTranslation('name', 'fr', 'testValue_fr');
    $model->setTranslation('name', 'tr', 'testValue_tr');
    $model->save();
    
    
    $model->refresh()->locales();
    // ['en', 'fr', 'tr']

[mnkincir]

It is an important situation so that we can more easily see in which languages the content is added.

[freekmurze]

Thanks!