[damned-lies] Fixes #173 - Sync username accepted chars with Django standards

[Claude Paroz <claudep src gnome org>]

commit 6892740a1a8bad3c918fed91cd8264f1658b47cc
Author: Claude Paroz <claude 2xlibre net>
Date:   Fri Apr 10 11:45:59 2020 +0200

    Fixes #173 - Sync username accepted chars with Django standards

 people/forms.py | 14 ++++++++++----
 people/tests.py |  2 +-
 2 files changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/people/forms.py b/people/forms.py
index 0a8436a5..4faa41e7 100644
--- a/people/forms.py
+++ b/people/forms.py
@@ -14,13 +14,19 @@ from common.utils import send_mail
 from teams.models import Team
 from people.models import Person
 
+from django.contrib.auth.validators import UnicodeUsernameValidator
+from django.contrib.auth.forms import UsernameField
+
+username_validator = UnicodeUsernameValidator()
+
 
 class RegistrationForm(forms.Form):
     """ Form for user registration """
-    username = forms.RegexField(widget=forms.TextInput(attrs={'class': 'form-control'}),
-                               max_length=30, regex=r'^\w+$',
-                               label=gettext_lazy('Choose a username:'),
-                               help_text=gettext_lazy('May contain only letters, numbers, underscores or 
hyphens'))
+    username = UsernameField(max_length=30,
+                             label=gettext_lazy('Choose a username:'),
+                             validators=[username_validator],
+                             help_text=gettext_lazy('May contain only letters, numbers, and @/./+/-/_ 
characters.'),
+                             widget=forms.TextInput(attrs={'class': 'form-control'}))
     email = forms.EmailField(widget=forms.TextInput(attrs={'class': 'form-control'}),
                                label=gettext_lazy('Email:'))
     password1 = forms.CharField(widget=forms.PasswordInput(attrs={'class': 
'form-control'},render_value=False),
diff --git a/people/tests.py b/people/tests.py
index 7d81cd7c..f823bb93 100644
--- a/people/tests.py
+++ b/people/tests.py
@@ -26,7 +26,7 @@ class PeopleTestCase(TestCase):
         return pn
 
     def test_register(self):
-        username = 'tèst01'
+        username = 'tèst-01'
         response = self.client.post(
             reverse('register'),
             {'username': username, 'password1': '1234567',