[TYPO3-50-general] Username validation fail in frontend Registration

[Dmitri Pisarev]

Hey!
I have imported demo website into the master branch, tried to create a 
new user with auto generated information, and got a:
"Only letters, numbers, spaces and certain punctuation marks are expected."
Then I removed  "@validate Label" from the model of fild username, and 
all works fine now.
What's up with that validator?

Regards,
Dmitri.