### Fixes: #11582
Not sure if this is the correct fix or not. The reason that the custom field errors were not shown is that messages.html only shows non_field_errors if the form passed to the context is named form. This is probably an issue in more places, but not sure how to make it generic. A change to messages.html would also need to support formsets.
Any input appreciated @jeremystretch or @arthanson
* Clean up & comment base templates
* Clean up login template & form
* Use SVG file for NetBox logo
* Simplify breadcrumbs
* Merge changelog.html into home.html
* Rename title_container block to header
* Move breadcrumbs block to object.html
* Attach names to endblock template tags
* Reorganize root-level templates into base/ and inc/
* Remove obsolete reference to Bootstrap 3.4.1
