diff --git a/apps/files/ajax/upload.php b/apps/files/ajax/upload.php
index e7823bc4ff..2a2d935da6 100644
--- a/apps/files/ajax/upload.php
+++ b/apps/files/ajax/upload.php
@@ -8,14 +8,15 @@ OCP\JSON::setContentTypeHeader('text/plain');
 
 OCP\JSON::checkLoggedIn();
 OCP\JSON::callCheck();
+$l=OC_L10N::get('files');
 
 if (!isset($_FILES['files'])) {
-	OCP\JSON::error(array('data' => array( 'message' => 'No file was uploaded. Unknown error' )));
+	OCP\JSON::error(array('data' => array( 'message' => $l->t( 'No file was uploaded. Unknown error' ))));
 	exit();
 }
+
 foreach ($_FILES['files']['error'] as $error) {
 	if ($error != 0) {
-		$l=OC_L10N::get('files');
 		$errors = array(
 			UPLOAD_ERR_OK=>$l->t('There is no error, the file uploaded with success'),
 			UPLOAD_ERR_INI_SIZE=>$l->t('The uploaded file exceeds the upload_max_filesize directive in php.ini: ')
@@ -41,7 +42,7 @@ foreach($files['size'] as $size) {
 	$totalSize+=$size;
 }
 if($totalSize>OC_Filesystem::free_space($dir)) {
-	OCP\JSON::error(array('data' => array( 'message' => 'Not enough space available' )));
+	OCP\JSON::error(array('data' => array( 'message' => $l->t( 'Not enough space available' ))));
 	exit();
 }
 
@@ -65,7 +66,7 @@ if(strpos($dir, '..') === false) {
 	OCP\JSON::encodedPrint($result);
 	exit();
 } else {
-	$error='invalid dir';
+	$error=$l->t( 'Invalid directory.' );
 }
 
-OCP\JSON::error(array('data' => array('error' => $error, 'file' => $fileName)));
+OCP\JSON::error(array('data' => array('message' => $error )));