Double-byte characters (such as Chinese, Japanese, and Korean characters) must be typed through an Input Method Editor (IME). The Client IME provides a way to type such characters by means of any IME that is compatible with Citrix Receiver on the client side, such as the Windows native CJK IME.
This feature is installed automatically when you install the Linux VDA.
Open a XenDesktop or XenApp session as per usual.
Change your input method as required on the client side to start using the Client IME.