Less¹ ugly way to validate user at registration².

1: little less.
2: or not³.
3: it still is Java.

Ho yeah, did I mention it does not work? Error messages still have to be
configured somehow in some funny Java-springesque way, in some file(s),
in some sub-sub-sub-directory somewhere. And password confirmation, yet
being used as any other field⁴, does not work.

4: I think, it is not that late.