Currently, the automatic edit summary that appears when reverting an edit (as defined at MediaWiki:Revertpage), says "Reverted edits by X to last revision by Y".
In some cases (maybe even most cases), the word "edits" is confusing, because only one edit is reverted.
Therefore, I suggest adding a new parameter to "MediaWiki:Revertpage", which defines the number of edits being reverted. In this way, the edit summary could say "edit" if only one edit is reverted, and "edits" if more than one edit is reverted.