cleanup namespace usages for L10n

src/Module/Attach.php

@@ -7,9 +7,7 @@
 namespace Friendica\Module;
 
 use Friendica\BaseModule;
-use Friendica\Core\L10n;
 use Friendica\Core\Logger;
-use Friendica\Core\System;
 use Friendica\DI;
 use Friendica\Model\Attach as MAttach;