How did you add other "languages output" in QubesOS?

Hi, everyone, as the title said, I can’t figured out how to add other languages output.
What I want to do is output Japanese (also other languages) words, I’ve tried:

go to dom0's settings manager -> keyboard 
 -> layout -> add Japanese and others

but all of them are failed, and only output English.


I’m still having the same problem, it seems to be a big issue, it can be resolved since one year. I-ve already the fresh Q4.1 new installation. it tells me when I connect keyboard to a VM and want to change the keyboard layout, I get: “Please update the qube XYZ or its template to the newest version of Qubes tools”. Is there an old version installed pr whats the point there
thank for any help.