Description of problem:
When create new user and type invalid username you get messages:

1. Only alpha lower, digit, dot and underscore lowercase characters are allowed for the field "User Name"
2. The field "User Name" must end with a character or digit instead of "T"

In my opinion there should be:
1. Only alpha lower, digit, dot and underscore are allowed for the field "User Name"
2. The field "User Name" must end with a lower character or digit instead of "T"