How to Customize the sub-template for AbsenceApprovalNotificationTemplate?

I want to change a couple of words in the content of "AbsenceApprovalNotificationTemplate" workflow notification.

As the required place was not found in the AbsenceApprovalNotificationTemplate.rtf I followed the oracle docs to customize it's sub templates further.

Under Common Content -> Templates folder I found the WorkflowNotificationSubTemplate.xsbz
Once extracted the only rtf file I could find is "_template_en.rtf"

There also I'm unable to find the exact place that I should edit. (refer the docx including the screenshot. the highlighted text should be changed)

Following document is the "_template_en.rtf" saved in docx format as rtf format is unable to attach here.