Converts HTML-entities to their UTF-8 character equivalents.
This requires the admin_forum permission.
Pre-condition: UTF-8 has been set as database and global character set.
It is divided in steps of 10 seconds.
This action is linked from the maintenance screen (if applicable).
It is accessed by ?action=admin;area=maintain;sa=database;activity=convertentities.
uses Admin template, convert_entities sub-template.