Existing nested translations are dropped

[alpaxo]

When a path-based namespace is used, e.g. {{ __('module/submodule/messages.Test')}} and a file xx/module/submodule/messages.php exists with keys

<?php

return [
	'Test' => 'Test Message',
	'Another' => 'Another Message',
];

After running php artisan localize xx the file is overwritten with empty key values

<?php

return [
	'Test' => '',
	'Another' => '',
];