Originally I have installed Pretashop in subfolder (www.grandcoralaustralia.com.au/Grandcoral) but once I moved to root (httpdocs) (www.grandcoralaustralia.com.au) . The language link is not point to www.grandcoralaustralia.com.au/th but www.grandcoralaustralia.com.au/th/Grandcoral so I deleted Thai...