Hello Belet and thank you for your patience on this matter.
Could you indicate the sequence of events that you experience during the attempt to change the language
Provide a screen shot of the preferences window complete with the Chinese language and APPLY option.
Provide a screen shot of the PD software before and after attempts to change the language.
Would it be possible to send the trace file for the sequence of events you have described above.
Open PD, follow the process to change the language to the point where you are requested to restart the program.
Select YES and PD will restart in what should be the desired language.
Close PD and locate the trace file.
Could you then post the trace file here or better still for your own privacy, could you send the trace file for my attention to email@example.com
Rest assured when this is resolved I will post the fix here.
Sorry for all the questions Belet but this will help the engineers to pursue this concern.