Hi,
In static/js folder there is a csrf.js ( for ajax ).
But I couldn't find the line you are calling it, in the template files.
And why cookie.js is needed ? ( there is no comment line for this )?

When I add cookie.js I get error:

jquery.min.js:2 jQuery.Deferred exception: $.cookie is not a function TypeError: $.cookie is not a function
at HTMLDocument. (http://127.0.0.1:8000/admin/media_library/media/?:467:28)
at j (http://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js:2:29999)
at k (http://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js:2:30313) undefined

Thank you very much...