Rename and rework profile packege (new name settings)

web/app/auth/forms.py

@@ -1,3 +1,4 @@
+from flask import current_app
 from ..models import User
 from flask_wtf import FlaskForm
 from wtforms import (BooleanField, PasswordField, StringField, SubmitField,
@@ -17,9 +18,9 @@ class RegistrationForm(FlaskForm):
     username = StringField(
         'Username',
         validators=[DataRequired(), Length(1, 64),
-                    Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0,
-                           'Usernames must have only letters, numbers, dots '
-                           'or underscores')]
+                    Regexp(current_app.config['ALLOWED_USERNAME_REGEX'],
+                           message='Usernames must have only letters, numbers,'
+                                   ' dots or underscores')]
     )
     password = PasswordField(
         'Password',