Enable calendar in date pickers
In some cases you can get an error “The JIRA Calendar does not currently support your language.“ when you trying to change date with built-in datepicker
To solve this problem you should:
Add Javascript file with Ukrainian translation to
atlassian-jira/includes/js/calendar/lang/
Add this javascript file as a downloadable web resource. Modify the fileÂ
"jira-install-dir"/atlassian-jira/WEB-INF/classes/system-webresources-plugin.xml
 to include the following:<web-resource key="calendar-uk" i18n-name-key="admin.web.resources.plugin.calendar.uk.name" name="Calendar" state='enabled'> <resource type="download" name="calendar-uk.js" location="/includes/js/calendar/lang/calendar-uk.js"> <param name="source" value="webContextStatic"/> </resource> <context>atl.global</context> <context>atl.general</context> <context>customerportal</context> </web-resource>
Add an entry mapping the filename to your language code
uk=calendar_uk.js
in the fileÂ"jira-install-dir"/atlassian-jira/WEB-INF/classes/calendar-language-util.properties
Reboot Jira.