Description for Epic and Story are not showing on Issue Types or help page

Summary

The Epic and Story description are wrong on the help page.

• <instance-url>/secure/ShowConstantsHelp.jspa?decorator=popup#IssueTypes

Steps to Reproduce

1. In the instance click to create an issue;
2. On the right side of Issue Type click on the help button.

Expected Results

Shows the right description.

Actual Results

It also shows these incorrect strings on the Issue Types page in administration.

Workaround

Always generate backup of your database before making any changes to it via SQL. Any workaround requiring SQL changes carries inherent risk so a backup of your DB is essential to restore working conditions if there is a critical problem.

1. Execute the following queries in your database:
  If you are using languages other than English, please replace the description string in        queries with respective translation

UPDATE issuetype SET description='A problem which impairs or prevents the functions of the product.'
WHERE description='jira.translation.issuetype.bug.name.desc'

UPDATE issuetype SET description='Created by JIRA Software - do not edit or delete. Issue type for a big user story that needs to be broken down.'
WHERE description='gh.issue.epic.desc'

UPDATE issuetype SET description='Created by JIRA Software - do not edit or delete. Issue type for a user story.'
WHERE description='gh.issue.story.desc'

2. Restart the JIRA instance