For 5.3 版本
這個語系檔來自 https://code.google.com/p/whmcs-cht/ 並經過重新校對與潤飾。
由此下載 https://github.com/asika32764/whmcs-zhtw-language-pack/raw/master/invoice/Droid_Sans_Fallback.zip
cd /your/whmcs/includes/classes/TCPDF/fonts
wget https://github.com/asika32764/whmcs-zhtw-language-pack/raw/master/invoice/Droid_Sans_Fallback.zip
unzip Droid_Sans_Fallback.zip
接著在 General Setting 的 invoice 分頁,將字體改成 Custom 並填入 droidsansfallback
即可發送中文字體的發票