Date picker format incorrect when using Dutch(Belgium) language

Step to reproduce:

1. Change Locale to Dutch
2. Create(or Edit) issue.
3. Select a date like below.
   
4. Error You did not enter a valid date. Please enter the date in the format "d/MMM/yy", eg. "2/dec/10" will show. No error throw in log.
   

Workaround:

1. Change the Month format to lower case in both calendar-nl.js and calendar-nl-min.js (via JIRA_installation\atlassian-jira\includes\js\calendar\lang) as below:

• calendar-nl.js

  Calendar._SMN = new Array
  ("jan",
   "feb",
   "mrt",
   "apr",
   "mei",
   "jun",
   "jul",
   "aug",
   "sep",
   "okt",
   "nov",
   "dec");
  

• calendar-nl-min.js

  Calendar._SMN=new Array("jan","feb","mrt","apr","mei","jun","jul","aug","sep","okt","nov","dec")
  

1. Restart JIRA.