Location: PHPKode > projects > ADP Forum > adp-forum/doc/language_info.txt
According to the language file used you must add something in the head tag in header file "header.php"

example 
for polish lang file you must add :

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-2">
<meta http-equiv="Content-Language" content="pl">
</head>
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