Date Time Picker gives error if user's language is Japanese

Issue Summary

If the user's language is Japanese, an error occurs when trying to enter the date and time using the Date Time Picker.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Create a custom field with the `Data time picker` type and associate it to project screens 
2. Set language to Japanese in user profile
3. Enter the date and time from the calendar into the Date Time Picker and create an assignment.

Expected Results

no error occurs

Actual Results

bellow error occurs.

無効な日付の形式です。日付は 'dd/MMM/yy h:mm a' の形式で入力してください。

this means "Invalid date format. Please enter the date in the format 'dd/MMM/yy h:mm a'."

Workaround

• Changing the Date Time Range Picker format to 24h format
• When inputting from the calendar, the input will be as shown below, but please change the "AM" part to "午前".
  "15/4/24 05:42 AM"
• Set language to English in user profile
• Once set to English, then back to Japanese setting
• Correct AM/PM to "午前/午後"