* The display of the language list on the preferences is more comply with the
BCP 47 standards.
* (bug 19849) Custom X-Vary-Options header now disabled unless $wgUseXVO is set
+* (bug 19301) Duplicates entries in $wgAddGroups, $wgRemoveGroups,
+ $wgGroupsAddToSelf and $wgGroupsRemoveFromSelf are no more displayed on
+ Special:ListGroupRights
== API changes in 1.16 ==