Manual:$wgRecentChangesFlags

Details
Allow modification of flags on Special:RecentChanges, Special:Watchlist and Special:RecentChangesLinked.


 * The 'letter' key is a message, which is used as text of the  .


 * The 'title' key is a message, which is used as title attribute of the  .


 * The optional 'class' key allows to set a CSS class different than the flag name.