I want to hide/change the name displayed in the header bar, the label that I want to change is "DJANGO" word as the next image shows"
Another solution for customizing the admin header.
Just copy /django/contrib/admin/templates/admin/base_site.html
from django source (Link Here) and paste it under your templates directory.
For example,
your_project/templates/admin/base_site.html
Now you can change whatever you like in this template.
Hope this helps.