In testing version of my zencart the admin directory isn't renamed.
I've copied from folder of easy populate /admin/easypopulate.php in directory /admin of my site and easypopulate.php from folder of easy populate /admin/includes/languages/english in same directory of my site.
My default language is Italian and I've too create directory admin/includes/languages/italian and copied easypopulate.php from english to it.
I'm running zencart 1.3.8
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Stefano
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