Steps to reproduce
- Add new page, example - redirect template
- set page name to "left:right"
- hit next
- observe error
.. Logs, screenshots, gifs...
Expected results
- page should be created
- : should be converted to a usable character for the page url
- or a message to the author user to explain why it's not allowed
This is related to JCR / XML namespaces, but shouldn't impact content authoring.