MediaWiki:Configure-old-summary/qqq

Parameters:
 * $1 - a link to the page, the time and date of the version is the link anchor
 * $2 - an internal or external link the user who made the version with the user name as the link anchor, or empty, or a text identifying the user without a link
 * $3 - a link to the diff page of this version and the version preceeding it, or empty
 * $4 - the comment, as provided by the user, which may be empty