Fix moderator's being unexpectedly notified of username changes when they do not have permission
Do not count rejected username changes when applying a limit of username changes in a given period. Set the "Count rejected username changes in period" option to revert to the old behavior
Normalize 'user name' text to 'username' and tweak some phrases
Fix unexpectedly strict username history permission check (Effected v4.0.6 only)
Fix "Display previous username list to" option not applying as expected
Fix "Username change interval" being ignored when computing the next username change time based on the XF option "Minimum time between username changes"