magento/magento2 — pull request #75 by amenk (2012-09-04 13:57:13+00:00)
Title: String "Place Order" is not pulled from the Checkout module

The Place Order button is a Mage_Core_Block_Template instance and so the __ function tries to pull the translation from Mage_Core, not from Mage_Checkout as it is defined in the translation files.