Please add these lines to the config file for de.labs.wm.o and en.labs.wm.o:
$wgGroupsAddToSelf = array( 'editor', 'reviewer' );
$wgGroupsRemoveFromSelf = array( 'editor', 'reviewer' );
It's needed to allow betatester to assign these rights to itself. Formerly it was Special:MakeReviewer which was deleted by Aaron. Thanks.
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Severity: normal