You can install the required locales by calling the console command
php artisan lang:add <locale>, passing it one or more locale codes, separated by a space:
If the target files exist, you will be asked what to do in this case - skip installing the files or replace them.
If these files contain keys that you added, it is recommended to skip them, since the
php artisan lang:update command will be able to update the files without deleting your code.