#agregar templatetags a APPS de settings

1.-
apps/templatetags/userInfoTag.py

# -*- coding: utf-8 -*-
from django import template
from django.shortcuts import get_object_or_404
from django.contrib.auth.models import User

register = template.Library()
@register.inclusion_tag('admin/users/inclusionTags/userRecordsTags.html', takes_context=True)
def userRecords(context):
    request = context['request']
    user = get_object_or_404(User, id=request.user.id)
    userName = user.first_name + ' ' + user.last_name
   
    return {'userName': userName}

2.-
apps/templatetags/__init__.py
from django.template import add_to_builtins
add_to_builtins('templatetags.userInfoTag')

3.-
templates/admin/users/inclusionTags/userRecordsTags.html
{{ userName }} # return value of userInfotag.py

4.- 

#se puede usar la plantilla userRecords.html en culaquiera otra plantilla

templates/admin/users/indexSuccess.html
<td>{% userRecords %}</td>  #def userRecords