Issue Summary

Excerpt macro  adds the spacekey to its header if the page title has the colon : symbol

This is reproducible (yes) 

Steps to Reproduce

1. Create a page with the page title containing the colon symbol (ex: Test:Title)
2. Insert an excerpt macro, add some content to it and publish the page
3. Create another page and insert the excerpt include macro configuring it with the Test:Title page.

Expected Results

As both the pages are on the same space, the excerpt include macro header should have just the page title. i.e Test:Title

Actual Results

The excerpt include macro header contains the spacekey along with the page title ie. SK:Test:Title

Workaround

Currently, there is no known workaround for this behaviour. A workaround will be added here when available