I just discovered today that the standard Zen Configuration in Admin/Configuration/Minimum Values is not suitable for Japanese.

Here are the ones that I changed to one as some Japanese names are a single character:

First Name: 1
Nickame: 1
Last Name: 1
Street Address: 1
Company: 1
Post Code: 1
City: 1
State: 1

Perhaps there are other areas that I am not aware of that need tweaking... I would appreciate any input!