Date comparison does not work in web ui

1. install Nuxeo
2. install Web UI
3. create a workspace
4. create a note named A with title A an expiration date
5. create a note named B with title B a different expiration date
6. click the workspace on the left side panel
7. select both notes
8. click the compare icon at the top right part of the page
9. observe the comparison only shows the difference of title but nothing about dates

Expected behavior: the date field should be listed
Note: this seems to be due to a nuxeo-date-diff element misspelled:
https://github.com/nuxeo/nuxeo-web-ui/blob/master/elements/diff/imports.html#L28
https://github.com/nuxeo/nuxeo-web-ui/blob/10.10/elements/diff/imports.html#L28