I installed the: taxonomy_vtn error

I installed the: taxonomy_vtn-6.x-1.3.tar.gz

appear warning:Your server does not support setlocale or your version of php is too old (use >= 4.4.0 or >= 5.0.2).
In other words, the alphabetical index sorting with letters such as ą ę ń cannot be properly sorted in your language.

check phpinfo.php
me PHP Version 5.2.6
drupal Version 6.10

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HELP~~ me to settle a problem ~~thanks