Add translation key for No group

Author: amosfolz

app/sprinkles/admin/locale/en_US/messages.php

@@ -59,6 +59,7 @@
         'MANAGE'              => 'Manage group',
         'NAME'                => 'Group name',
         'NAME_EXPLAIN'        => 'Please enter a name for the group',
+        'NONE'                => 'No group',
         'NOT_EMPTY'           => "You can't do that because there are still users associated with the group <strong>{{name}}</strong>.",
         'PAGE_DESCRIPTION'    => 'A listing of the groups for your site.  Provides management tools for editing and deleting groups.',
         'SUMMARY'             => 'Group Summary',

app/sprinkles/admin/templates/forms/user.html.twig

@@ -25,7 +25,8 @@
                             <input type="text" class="form-control" name="theme" value="{{user.group.name}}" disabled>
                         {% else %}
                             <select id="input-group" class="form-control js-select2" name="group_id">
-                                <option value="0">No group</option>
+                                <option value="0">{{translate('GROUP.NONE')}}</option>
+                                <option disabled="disabled">-----</option>
                                 {% for group in groups %}
                                 <option value="{{group.id}}" {% if (group.id == user.group_id) %}selected{% endif %}>{{group.name}}</option>
                                 {% endfor %}