Commented on issue #X" links on project activity page should use "external_url" variable for links
On the activity page of a project, if you click on the hash number of a project, 127.0.0.1 is used.
Steps to reproduce
Click on "Commented on <issue number" on the Project Activity Page.
What is the expected correct behavior?
The external_url variable should be used like everywhere else.
This problem seems to be new in Community Edition 12.3.2, it does not appear on GitLab.com (Enterprise Edition 12.3.0 pre)