Issue a warning when operators create a link with %23 in the URL

Bradley Bartram (1219)

The link replacer will automatically decode the %23 into a # in the final URL resulting in 404 errors:

https://www.host.com/amazing_pic#.jpg becomes https://www.host.com/amazing_pic#23.jpg, which is a different URL than intended.

Operators should be warned about this when entering an affected URL in the drag & drop editor.