civicrm/civicrm-core — pull request #1676 by pratik-joshi (2013-09-23 14:51:13+00:00)
Title: CRM-13428 - to maintain uniform approach of pdf receipt sending process kept receipt file name same as done in other cases (like contribution / event online receipts)

The PR submitted by reporter for CRM-13428 - https://github.com/civicrm/civicrm-core/pull/1670 uses ts() function ,

to maintain uniform approach of pdf receipt sending process - kept receipt file name same as done in other cases (like contribution / event online receipts) i.e. not using ts() function