And add comments

erp5_document_scanner: add an alarm which will delete outdated (>5 days old) active_process created by the dialog.

With this, we can search easily active processes used by document scanner and remove them

With the size close to the thumbnail, to replace the `new` button text

Drop the current displayed text

To translate all texts, we added more promises and queues to make sure everything works as expected

Clean up and Change all gadget's CSS rules to be prefixed by  `div[data-gadget-url$="gadget_document_scanner.html"]`