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For example, the default translations are applied to EN_US locale. This means that the service account must have a non EN_US locale, EN_UK for instance.
If I install the SAFe EPIC to Feature Translator for Jira what will happen with current filters applied on Epics?
All saved JQL filters that contain "Epic" will continue to work.
Note that such JQL filters will still be displayed with the "Epic" in their JQL field. If you edit such filter, then the word "Epic" will be replaced by issue type ID or custom field ID, see explanation of this here.