Login as admin.
Go to "Site administration > Plugins > Plugins overview".
Verify there is no longer a mention of the 'Word censorship' filter.
Create a course.
Add a forum.
Enrol student s1.
Login as student s1.
Access to the course and post a discussion in the forum containing any of the bad words defined in the 'badwords' string in the lang file .
Check the bad words are displayed (so they are not replaced by asterisks).
Moppies Kanban
Remove filter_censor from core and add it to the plugins directory.
Eloy discovered that it's not working as expected from, at least, 3.9 onwards: MDL-72336. And Helen mentioned that, even when it was working pre-3.9, it didn't work well (e.g. MDL-61336).