Improve Chinese and Japanese localized dates in the Header of Datepicker

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, Master
• Fix Version/s: 7.0.0 DXP FP45, 7.0.6 CE GA7, 7.0.0 DXP SP8, 7.0.X, 7.1.0 M2, 7.1.X, Master
• Component/s: Calendar, Frontend Infrastructure > UI Taglibs
• Labels:
  • liferay-digital-enterprise-70-sp8
  • liferay-fixpack-de-45-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/56570

Summary
The Header of Datepicker is not displaying date correctly in Chinese and Japanese localization. It seems to follow the US standard of "mm yyyy" instead of "yyyy年mm月". 

Steps to verify:

1. Change language to Chinese or Japanese
2. Account Settings (or any page that has Datepicker component)
3. Click Birthday 

Expected Result:
In Chinese or Japanese localization Header of Datepicker should show "yyyy年mm月(1970年1月)" instead of "mm yyyy(1月 1970)".