Please Verify: language_en_UK.jar should be removed from JIRA standalone when customising text

I need developer help to verify this customer's comment:
http://confluence.atlassian.com/display/JIRA/Customizing+text?focusedCommentId=169607212#comment-169607212

Basically the customer has said that the language_en_UK.jar should be removed from JIRA standalone when customising text. The statement he is referring to is:

If you are using the WAR/Webapp distribution of JIRA, you should extract the jar from webapp/WEB-INF/lib to edit-webapp/WEB-INF/classes and remove the webapp/WEB-INF/lib/language_default.jar and (if using English) webapp/WEB-INF/lib/language_en_UK.jar (using the correct jar for your language).

Please verify and I will update the document accordingly.