[spiral/translator] Load translations from many directories

[gam6itko]

Description

I have separate project with my own Checkers. Also this repo contains translations for validation errors.
At the moment, to include translations I have to copy the translation files manually to app/locale folder.

Example

translator config file should look like this

return [
    'locale' => 'en',
    'cacheLocales' => !in_array(env('APP_ENV'), ['local']),

    'directories' => [
        directory('locale'),
        directory('vendor').'/spiral/validator/locale',
        directory('vendor').'/gam6itko/my-checkers/locale',
    ],
];

[gam6itko]

Associated with spiral/validator#12