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you can find default.po, and default.mo
in theme root, all what you need download this 2 files in you mac/pc and rename it to your language you can find all wordpress language files name here : http://codex.wordpress.org/WordPress_in_Your_Language
for example French : rename the files to be fr_FR.po, fr_FR.mo
and download this app : http://www.poedit.net/download.php
and translate the po file then upload it again to the theme root