Steps to Reproduce:
- Start up 7.0.x
- Go to Control Panel > Sites > Page Templates, and add new Page Template with the name "Page: Prospect".
- Upgrade to master.
- Go to staging Global site > Site Builder > Page Templates.
- Check "Page: Prospect" template name.
":" is no longer a valid character so it must have been substituted by "-"
":" remains as part of the name.