Private Messages: Advanced search in folders to use jQuery datepicker

Within https://source.sakaiproject.org/svn/jsf/trunk/jsf-widgets/src/java/org/sakaiproject/jsf/Configuration_sv.properties and Configuration_ja.properties, they are set as inputMonthFirstFormat=yyyy-MM-dd and yyyy/MM/dd. It is because those language speakers use the Year, Month, Date format.
But sakai:input_date does not support it. If the date-picker was used in those locales, the date is output as Month, Date, Year format.

Steps to reproduce:
1. Move to My Workspace -> Preferences -> Language, and set it to Swedish or Japanese.
2. Move to Messages.
3. Select a folder -> 'Advanced Search' link -> date-picker icon.
4. Select a date from the pop-up calendar. Then the date is output in Month, Date, Year format.