The default and recommended value of $wgActiveUserDays is 30. However, if this is different, the third benefit should adapt accordingly.
The magic word NUMBEROFACTIVEUSERS is used in MediaWiki:createacct-benefit-head3. The current text of the corresponding MediaWiki:createacct-benefit-body3 is "contributors this month". This is the part that should output correct text regardless of $wgActiveUserDays. We prefer to keep "this month" if it *is* the default 30-day value.
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=47693