When I edit an alias, the message in the edit summary, that appears in the history/watchlist is: "Updated [language] alias", and then the old alias. For more clarity, it should probably show the new alias that has been entered.
Tested here: I changed the French alias from "Bac à Sable (7rkujizi)" to "test" and the message appearing in the edit summary is the previous alias.
Requested by the community here