File uploader renames with other ext

Resources/public/js/FileUploader.js

@@ -20,7 +20,7 @@ function PunkAveFileUploader(options)
     _.each(files, function(file) {
       appendEditableImage({
         // cmsMediaUrl is a global variable set by the underscoreTemplates partial of MediaItems.html.twig
-        'thumbnail_url': viewUrl + '/thumbnails/' + file,
+        'thumbnail_url': viewUrl + '/thumbnails/' + encodeURIComponent(file),
         'url': viewUrl + '/originals/' + file,
         'name': file
         });