thainuke writes:  

Easy way to change the title name of block base on the language people select.
If a user use english the title to be in english, if the user choose thai the title in thai.
Here is the quickly way !!!Open the file mainfile.php
in function blocks($side) {
...
Search:
$title = $row[title];
Replace with:
$title = translate($row[title]);
...
}

And your language file (language/lang-XXX.php)
in function translate($phrase) {
...
Add your title name of block in your language etc.
case "Languages": $tmp = "ภาษา"; break;
case "Who's Online": $tmp = "ผู้ใช้งานขณะนี้"; break;
case "Modules": $tmp = "เมนูหลัก"; break;
case "Survey": $tmp = "แบบสำรวจ"; break;
case "Login": $tmp = "เข้าระบบ"; break;
case "Search": $tmp = "ค้นหา"; break;
case "Information": $tmp = "แหล่งข้อมูล"; break;
case "Old Articles": $tmp = "บทความที่ผ่านมา"; break;
case "Big Story of Today": $tmp = "เรื่องใหญ่ประจำวัน"; break;
...
}