Update grappelli/views/related.py

Using standard json library
Fixed inconsistencies in the breadcrumb section of reversion templates, added the missing translation templates tags too
added white-space:pre for <pre> elements within grp-readonly, see #309
Merge pull request #297 from nnmware/master

Simplejson deprecated in new version of Django
Merge branch 'master' into stable/2.4.x
updated docs, fixed #300
added hint about static files finders to the docs, see #214
Merge pull request #304 from michelmichel/stable/2.4.x

Fixed inconsistencies in the breadcrumb section of reversion templates, ...
parsing query_string with autocompletes, fixed #308
fixed deprecation warning with urls, see #301, #305, #310
removed dashboard content, fixed #306
fixed typing error with js function
hide elements with "display:none" in .grp-closed, fixed #316
removed the peculiar new url–field improvement (?) by whoever is not thinking about UI/UX changes … another nice hack makes my oh–so–glorious day even more delightful.
change log update
setup according to django