Rem: upload spinner.

attachmentGalery would need refactoring to an individual attachment
component with component state that could be set on the onUpdated event.

I'm not capable of doing this within reasonable time.

client/components/cards/attachments.jade

@@ -38,7 +38,7 @@ template(name="attachmentsGalery")
             else
               span.attachment-thumbnail-ext= extension
           else
-            +spinner
+            span.attachment-thumbnail-ext= extension
         p.attachment-details
           = name
           span.file-size ({{fileSize size}} KB)