Is there a way to get Epic Link customFieldID when Jira installation was done in German?
It has a different name so its not found when trying to get it using “Epic Link” name using the API
Will it be different for every Jira translation?
How do I detect Jira system language used for the installation?
I believe the field should always have the key “com.pyxis.greenhopper.jira:gh-epic-link” so you might be able to grab the field using that.
Thx, that is what we used 
The answer probably should be ‘use the jira software API’. Classes like ManagedCustomFieldsServiceImpl (Atlassian GreenHopper 6.7.7 API) offer getEpicLinkCustomField. This would get you the right field even in the case of duplicates.