Some of these refer to Alphas, report on the Forum if some strings are missing —
Edoardo Vacchi 2008/05/07 08:37
English (Bundled)
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Español Traducido por Joako9205 (Incluye plugins)
Greek translation by christosvas
English (bundled)
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German based on the old setup files by Christian alias tafkas
Greek translation by christosvas (now this file contains also the translation for plugins)
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Polish Incomplete this package has encoding issues (not utf-8) and lacks translation for plugins by
Michał Kostrzewa
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Croatian translation by Cvik (utf-8 translation with translation for plugins)
Learn how to create Lang Packs here
There are older versions of French, Hungarian listed here; you may want to start from there, if you speak one of these languages.