Brigadier: Command error messages are not translated

Almost all command error messagesare not translated. The jsons of them use key "text" instead of "translate" and "with".

You can set your game name a languages which is not English, then run a command. When it succeeds, it prints translated message. Instead when it fails, it prints untranslated message.

You can use a command block. For example, use a command block and run /kill @e[name="abc"] and use /data to get the LastOutput of it. You will find {"text":"No entity was found"} instead of {"translate":"commands.…"}.