Fix translate issue

Fixes issue where translations are not allowed to be reset by a theme or db change to the original english text.

Author: Corefix

lib/internal/Magento/Framework/Translate.php

@@ -312,6 +312,9 @@ protected function _addData($data)
     {
         foreach ($data as $key => $value) {
             if ($key === $value) {
+                if (isset($this->_data[$key])) {
+                    unset($this->_data[$key]);
+                }
                 continue;
             }