Steps to reproduce:

1. Log in to back office.
2. Go to Content / Content structure.
3. Expand Content-Tree from left side menu.
4. Select random content in Content-Tree and click on Send to Trash button from the botton of right side menu.
5. Verify if close button at notification popup has tooltip label.

Actual result:

See attachment.

Close button don't have tooltip information label.

Expected result:

Close button on send to trash notification should have tooltip label.