Added translations and removed fully qualified global functions

Author: pmarki

app/code/Magento/ImportExport/Controller/Adminhtml/Export/File/Delete.php

@@ -63,7 +63,7 @@ public function execute()
         $resultRedirect->setPath('adminhtml/export/index');
         $fileName = $this->getRequest()->getParam('filename');
         if (empty($fileName)) {
-            $this->messageManager->addErrorMessage(\__('Please provide valid export file name'));
+            $this->messageManager->addErrorMessage(__('Please provide valid export file name'));
 
             return $resultRedirect;
         }
@@ -73,9 +73,9 @@ public function execute()
 
             if ($directory->isFile($path)) {
                 $this->file->deleteFile($path);
-                $this->messageManager->addSuccessMessage(\__('File %1 deleted', $fileName));
+                $this->messageManager->addSuccessMessage(__('File %1 deleted', $fileName));
             } else {
-                $this->messageManager->addErrorMessage(\__('%1 is not a valid file', $fileName));
+                $this->messageManager->addErrorMessage(__('%1 is not a valid file', $fileName));
             }
         } catch (FileSystemException $exception) {
             $this->messageManager->addErrorMessage($exception->getMessage());

app/code/Magento/ImportExport/Controller/Adminhtml/Export/File/Download.php

@@ -61,8 +61,8 @@ public function execute()
         $resultRedirect = $this->resultRedirectFactory->create();
         $resultRedirect->setPath('adminhtml/export/index');
         $fileName = $this->getRequest()->getParam('filename');
-        if (empty($fileName) || \preg_match('/\.\.(\\\|\/)/', $fileName) !== 0) {
-            $this->messageManager->addErrorMessage(\__('Please provide valid export file name'));
+        if (empty($fileName) || preg_match('/\.\.(\\\|\/)/', $fileName) !== 0) {
+            $this->messageManager->addErrorMessage(__('Please provide valid export file name'));
 
             return $resultRedirect;
         }
@@ -76,7 +76,7 @@ public function execute()
                     DirectoryList::VAR_DIR
                 );
             }
-            $this->messageManager->addErrorMessage(\__('%1 is not a valid file', $fileName));
+            $this->messageManager->addErrorMessage(__('%1 is not a valid file', $fileName));
         } catch (\Exception $exception) {
             $this->messageManager->addErrorMessage($exception->getMessage());
         }

app/code/Magento/ImportExport/i18n/en_US.csv

@@ -124,3 +124,6 @@ Summary,Summary
 "Message is added to queue, wait to get your file soon. Make sure your cron job is running to export the file","Message is added to queue, wait to get your file soon. Make sure your cron job is running to export the file"
 "Invalid data","Invalid data"
 "Invalid response","Invalid response"
+"File %1 deleted","File %1 deleted"
+"Please provide valid export file name","Please provide valid export file name"
+"%1 is not a valid file","%1 is not a valid file"