Sign Up user with several spaces in username leads to the error

User is added into database but error is displayed after registration when username has more than one space in a row in the middle

Steps to reproduce:

1. Open JCommune main page -> “Sign up”
2. Enter Username with more than one space in a row in the middle
3. Enter valid values into other fields
4. Click “Sign up” button

Actual result:
1. Error message is displayed
2. User is added into database with one space in the middle of Username

Expected result:
1. Information message about successful registration is displayed
2. User is added into database with all space in the middle of Username

Notes: In the error message the word "occurred" is written with one "r": "occured"