Atención: El Jugador %s no envió un chequeo de datos y puede que haga trampas.
Translation shouldn't be bigger than 60 bytes.
That translated string has 78 characters itself, and some characters require more than 1 byte...
So just shorten it. Like this:
The 60 bytes are only for unit names, which have limited space in the savegames. The above text is printed on screen like a chat message, it should fit.