Така, пробвай този вариант
public_html\joomla\libraries\joomla\string\string.php
string.php в този файл намираш този код
if (function_exists('iconv'))
{
// These are settings that can be set inside code
iconv_set_encoding("internal_encoding", "UTF-8");
iconv_set_encoding("input_encoding", "UTF-8");
iconv_set_encoding("output_encoding", "UTF-8");
}
и го заменяш с този
if (function_exists('iconv') && PHP_VERSION_ID < 50600)
{
// These are settings that can be set inside code
iconv_set_encoding("internal_encoding", "UTF-8");
iconv_set_encoding("input_encoding", "UTF-8");
iconv_set_encoding("output_encoding", "UTF-8");
}
elseif (PHP_VERSION_ID >= 50600)
{
ini_set("default_charset", "UTF-8");
}