I added language_ja_JP.jar with translated .properties files, and switched to Japanese locale as default.
Then, I was trying to create a new issue and click calendar icon, but date picker was displayed with blank window.

I searched the exisiting bug with same situation and found the following comment:

http://jira.atlassian.com/browse/JRA-2652

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I'm in chinese environment(i'll use the calendar-zh.js in calendar.jsp). When click the date picker image in create-new-issue page, it will pop up a windows with a script error. Debug and find following error prompt:
Calendar._TT.DEF_DATE_FORMAT is null or it's not an object
(some this meaning in chinese).

And the cussor of the debugger stop at following the last line:
Calendar = function (mondayFirst, dateStr, onSelected, onClose) {
// member variables
this.activeDiv = null;
this.currentDateEl = null;
this.getDateStatus = null;
this.timeout = null;
this.onSelected = onSelected || null;
this.onClose = onClose || null;
this.dragging = false;
this.hidden = false;
this.minYear = 1970;
this.maxYear = 2050;
this.dateFormat = Calendar._TT["DEF_DATE_FORMAT"];
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Does anyone know a solution for this problem?

Shinji Taneto
shinji.taneto@portus.co.jp