I guess this is a bug reported in here : https://jira.atlassian.com/browse/JRA-27713
Anyway according to the latest reply from the bug ticket above:
Just info to all watchers.
Atlassian has just released InProduct translation plugin for JIRA.
It allows to translate JIRA right from its page so you can see all messages and provided translations live in a second. Just install the plugin in JIRA, select "Translate Page" from the user profile menu in JIRA and start translating.
The plugin is available in marketplace:https://marketplace.atlassian.com/plugins/com.atlassian.translations.jira.inproduct
You can install it from the UPM. It works with JIRA 5.1+.
Perhaps you can give it a try on the above alternative workaround for this issue.
Hopefully it helps :)
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