Reword export disk operation

circle/vm/operations.py

@@ -355,7 +355,7 @@ class DownloadDiskOperation(InstanceOperation):
 class ExportDiskOperation(InstanceOperation):
     id = 'export_disk'
     name = _('export disk')
-    description = _('Export disk to VMDK format.')
+    description = _('Export disk to the selected format.')
     abortable = True
     required_perms = ('storage.export_disk',)
     accept_states = ('STOPPED',)