Errors are imported in my translation interface

If I enter in a wrong date, the error returned is (for instance): "The entered date needs to be between the dates 1961-11-16 and 1970-01-01." That's ok.
But I happened to see that this same error is imported in my translation interface. Shown as a not translated built-in interface text, in my case that's Dutch. This is something I don't want!

Workaround(): When I translate "The entered date needs to be between the dates @Start and @End." the errors are not imported anymore. (but maybe I have to check and do this for every validation!?)