Replace default select fields.

biscuit/core/forms.py

 from django import forms
 from django.contrib.auth import get_user_model
 from django.utils.translation import ugettext_lazy as _
-from django_select2.forms import ModelSelect2MultipleWidget
+from django_select2.forms import ModelSelect2MultipleWidget, Select2Widget
 
 from .models import Person, Group, School, SchoolTerm
 
@@ -11,7 +11,7 @@ class PersonAccountForm(forms.ModelForm):
         model = Person
         fields = ['last_name', 'first_name', 'user']
 
-    new_user = forms.CharField(required=False)
+    new_user = forms.CharField(required=False, widget=Select2Widget(search_fields['username__icontains']))
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -49,7 +49,9 @@ class EditPersonForm(forms.ModelForm):
     new_user = forms.CharField(
         required=False,
         label=_('New user'),
-        help_text=_('Create a new account'))
+        help_text=_('Create a new account'),
+        widget=Select2Widget(search_fields['username__icontains'])
+    )
 
     def clean(self) -> None:
         User = get_user_model()

biscuit/core/templates/core/edit_person.html

@@ -11,6 +11,12 @@
 {% block bootstrap4_extra_head %}
   {{ block.super }}
   {{ edit_person_form.media }}
+  {{ edit_person_form.media.css }}
+{% endblock %}
+
+{% block bootstrap4_extra_script %}
+  {{ block.super }}
+  {{ edit_person_form.media.js }}
 {% endblock %}
 
 {% block content %}

biscuit/core/templates/core/persons_accounts.html

@@ -4,6 +4,16 @@
 
 {% load bootstrap4 i18n %}
 
+{% block bootstrap4_extra_head %}
+  {{ block.super }}
+  {{ persons_accounts_formset.media.css }}
+{% endblock %}
+
+{% block bootstrap4_extra_script %}
+  {{ block.super }}
+  {{ persons_accounts_formset.media.js }}
+{% endblock %}
+
 {% block bootstrap4_title %}{% blocktrans %}Link persons to accounts{% endblocktrans%} - {{ block.super }}{% endblock %}
 
 {% block page_title %}