Barryvdh\TranslationManager\Controller::loadLocales PHP Method

    protected function loadLocales()
    {
        //Set the default locale as the first one.
        $locales = Translation::groupBy('locale')->get()->pluck('locale');
        if ($locales instanceof Collection) {
            $locales = $locales->all();
        }
        $locales = array_merge([config('app.locale')], $locales);
        return array_unique($locales);
    }