Include attrs.html in form instance template

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/appearance/templates/appearance/generic_form_instance.html

@@ -53,7 +53,7 @@
                 {% if field|widget_type == 'checkboxinput' %}
                     <div class="checkbox">
                         <label>
-                            <input {% if field.value %}checked="checked"{% endif %} name="{% if form.prefix %}{{ form.prefix }}-{% endif %}{{ field.name }}" type="checkbox">
+                            <input {% if field.value %}checked="checked"{% endif %} name="{% if form.prefix %}{{ form.prefix }}-{% endif %}{{ field.name }}" type="checkbox" {% include 'django/forms/widgets/attrs.html' with widget=field.field.widget %} />
                             {% if not hide_labels %}{{ field.label }}{% if field.field.required and not read_only %} ({% trans 'required' %}){% endif %}{% endif %}
                         </label>
                     </div>

mayan/settings/base.py

@@ -55,6 +55,7 @@ INSTALLED_APPS = (
     'django.contrib.messages',
     'django.contrib.sessions',
     'django.contrib.sites',
+    'django.forms',
     # Allow using WhiteNoise in development
     'whitenoise.runserver_nostatic',
     'django.contrib.staticfiles',