Iteration IssuesInEpic doesn't work when change the issue type name epic

Title: Iteration IssuesInEpic doesn't work when change the issue type name epic

Short Description: If in your Jira instance you change the issue type name epic to another name, the iteration Issues In epic is not going to work

Steps to reproduce:

1. Go to the issues types page in your Jira instance and update the issue type name epic for another name
2. Install a template that exports iteration Issues In Epic
3. Go to an issue of type Epic with issues in the epic and export the template used in step 2

Actual Result: Iteration doesn't work. The template comes empty.

Expected Result: Iteration should work. It should export the issues inside the epic regardless of the name of the issue type.