Apply Patch 10415 to Magento 1.9.3.1

Hi there, We require a Freelancer to apply patch 10415 to our clients Magento 1.9.3.1 website. We have currently tried to apply the patch and received the following error (see screenshot also). We're happy for you to apply the patch to our testing website, we (vision8studio) can then apply the patch to live once you advise us on which error we need to fix and how. Ready to start ASAP, we require this completing ASAP (within the next couple of hours) also. Checking if patch can be applied/reverted successfully... ERROR: Patch can't be applied/reverted successfully. patching file app/[login to view URL] patching file app/code/core/Mage/Adminhtml/Block/Report/Review/[login to view URL] patching file app/code/core/Mage/Adminhtml/Block/Report/Tag/Product/[login to view URL] patching file app/code/core/Mage/Adminhtml/Block/Review/[login to view URL] patching file app/code/core/Mage/Adminhtml/Block/Review/Edit/[login to view URL] patching file app/code/core/Mage/Adminhtml/Controller/[login to view URL] patching file app/code/core/Mage/Adminhtml/Model/LayoutUpdate/[login to view URL] patching file app/code/core/Mage/Adminhtml/Model/System/Config/Backend/[login to view URL] patching file app/code/core/Mage/Api/Helper/[login to view URL] patching file app/code/core/Mage/Api/Model/Server/Adapter/[login to view URL] patching file app/code/core/Mage/Api/Model/Wsdl/[login to view URL] patching file app/code/core/Mage/Api/Model/Wsdl/Config/[login to view URL] patching file app/code/core/Mage/Core/Helper/[login to view URL] patching file app/code/core/Mage/Core/Model/File/Validator/[login to view URL] patching file app/code/core/Mage/Core/etc/[login to view URL] patching file app/code/core/Mage/Core/etc/[login to view URL] Hunk #1 succeeded at 653 (offset -21 lines). Hunk #2 succeeded at 663 (offset -21 lines). patching file app/code/core/Mage/Customer/Model/[login to view URL] patching file app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/[login to view URL] patching file app/code/core/Mage/Log/Helper/[login to view URL] patching file app/code/core/Mage/Rule/Model/[login to view URL] patching file app/code/core/Mage/Sales/Block/Adminhtml/Billing/Agreement/[login to view URL] patching file app/code/core/Zend/Form/Decorator/[login to view URL] patching file app/design/adminhtml/default/default/template/backup/[login to view URL] patching file app/design/adminhtml/default/default/template/sales/billing/agreement/view/tab/[login to view URL] patching file app/design/adminhtml/default/default/template/xmlconnect/edit/tab/[login to view URL] patching file app/design/adminhtml/default/default/template/xmlconnect/edit/tab/design/[login to view URL] patching file app/locale/en_US/[login to view URL] patching file app/locale/en_US/[login to view URL] Hunk #1 FAILED at 26. 1 out of 1 hunk FAILED -- saving rejects to file app/locale/en_US/[login to view URL] patching file js/mage/adminhtml/[login to view URL] patching file lib/Varien/Filter/[login to view URL] Done