Fix a unicode crash in the admin language list
Prevent a crash when updating pootle-terminology.po

When the file does not exist on disk, accessing attributes on
self.file will fail. So check for that in advance. If this happens
on anything else than pootle-terminology.po, log a warning.

Fixes #3254
Always check for pootle_path in @get_path_obj
Accept any amount of args in get_overview_stats()

This works around decorator madness
Get default last action in case it is not set

Fixes #3240.
Cleanup: Remove unused imports
Minor cleanups
Drop @commit_on_success in favour of transaction.atomic

See https://docs.djangoproject.com/en/1.6/topics/db/transactions/#changes-from-django-1-5-and-earlier
Drop support for Django 1.5
Bugfix: Use proper CSS syntax
Minor import order change
Release notes: Update third party software supported versions
Only show enabled projects on overviews

This aligns us with evernote. Looks like it was forgotten during
picking.