Description of problem:
The registration form for Zanata has input validation, i.e. restricts to lowercase letters and digits. The Account Details management form does not, and allows the saving of any characters as part of the username.

Version-Release number of selected component (if applicable):
Dev

How reproducible:
Easily, Always

Steps to Reproduce:
1. Click menu More, then Register
2. Enter user+++== in the username field
3. Note the error displayed
4. Log in as an administrator
5. Select menu More, Administration, Manage Users
6. Click Edit on a user
7. Enter user+++== in the username field
8. No validation message
9. Click Save
10. user+++== is saved

Actual results:
Username is accepted, bad characters and all

Expected results:
Username rejected

Additional info: