User:MediaWiki default

This user is a bot on Frontierpedia.
From Frontierpedia, the Microsoft Agent encyclopedia

This is the username used by the maintenance script rebuildmessages.php. The script is part of MediaWiki; it updates MediaWiki interface messages to be equal to the MediaWiki default. It may also reappear to recreate the main page on Frontierpedia.

The script has two modes of operation:

rebuildMessages.php --update
Updates any messages which were last edited by "MediaWiki default" to their current version. Creates any messages which did not exist.
rebuildMessages.php --rebuild
Updates all messages to their current default value, regardless of whether they have been manually edited. This is sometimes used on other wikis when a new messages file has just been created, with a comprehensive set of default messages.

If the MediaWiki default account name does not exist, edits made by this script have a user ID of zero so they are treated as anonymous edits in the page history, with a link to the user contributions instead of the user page.

The same username is also used by the MediaWiki installer. Installing MediaWiki has the same effect as rebuildMessages.php --update.