Product image not support other language

Product image not support other language

Please help me , Product picture not support other language .
I used image file in Thai (such as สวัสดีครับ.jpg) , when I uploaded image product . Those Image file are thumb___________________________________.jpg , how I can change ?

Thank you

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Aw: Product image not support other language

\components\com_jshopping\lib\uploadfile.class.php

function renameFileFilter($name){
$filters = array();
$filters["ü"] = "u";
$filters["ä"] = "a";
$filters["ö"] = "o";
$filters["Ü"] = "U";
$filters["Ä"] = "A";
$filters["Ö"] = "O";
$filters["ß"] = "ss";
foreach($filters as $k=>$v){
$name = str_replace($k, $v, $name);
}
$name = preg_replace("/[^a-zA-Z0-9\.\-]/", "_", $name);
return $name;
}

Aw: Product image not support other language

Thank sir ^____^