Hi Nioklay,
We've seen problems around this with i18n caching in JIRA core related to add-on upgrades. The only thing that seems to resolve this is a JIRA restart after the add-on's been installed.
Can you try this please?
Cheers,
Andreas
Hi Nikolay,
Sorry you are seeing this, but this may require some further debugging. Can you create a support request at - https://codebarrel.atlassian.net/servicedesk/customer/portal/1
I think it will have to be around a javascript error or not being able to load the i18n.js file.
Cheers,
Nick