Wagtail

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* Fix: Fix support of `ATOMIC_REBUILD` for projects with Elasticsearch client >=1.7.0 (Mikalai Radchuk)
* Fix: Logging an indexing failure on an object with a non-ASCII representation no longer crashes on Python 2 (Aram Dulyan)
* Fix: Rich text image chooser no longer skips format selection after a validation error (Matt Westcott)
* Fix: Null characters in URLs no longer crash the redirect middleware on PostgreSQL (Matt Westcott)

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* Fix: API listing views no longer fail when no site records are defined (Karl Hobley)
* Fix: Pinned Django REST Framework to <3.7 to restore Django 1.8 compatibility (Matt Westcott)
* Fix: Fixed crash in XML sitemap generator when all pages on the site are private (Stein Strindhaug)
* Fix: Fixed error in Postgres search backend when searching specific fields of a specific() Page queryset (Bertrand Bordage, Matt Westcott)
* Fix: Fixed error on Elasticsearch backend when passing a queryset as an `__in` filter (Karl Hobley, Matt Westcott)
* Fix: `__isnull` filters no longer fail on Elasticsearch 5 (Karl Hobley)
* Fix: Prevented intermittent failures on Postgres search backend when a field is defined as both a `SearchField` and a `FilterField` (Matt Westcott)

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* Fix: Migration for addition of `Page.draft_title` field is now reversible (Venelin Stoykov)
* Fix: Fixed failure on application startup when `ManifestStaticFilesStorage` is in use and `collectstatic` has not yet been run (Matt Westcott)
* Fix: Fixed handling of Vimeo and other oEmbed providers with a format parameter in the endpoint URL (Mitchel Cabuloy)
* Fix: Fixed regression in rendering save button in wagtail.contrib.settings edit view (Matt Westcott)

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* Fix: Prevent home page draft title from displaying as blank (Mikalai Radchuk, Matt Westcott)
* Fix: Fix regression on styling of preview button with more than one preview mode (Jack Paine)
* Fix: Enabled translations within date-time chooser widget (Lucas Moeskops)

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* Ability to configure the feature set of rich text fields on a per-field basis (Matt Westcott)
* New class-based configuration for media embeds (Karl Hobley)
* The admin interface now displays a title of the latest draft (Mikalai Radchuk)
* `RoutablePageMixin` now has a default "index" route (Andreas Nüßlein, Matt Westcott)
* Added multi-select form field to the form builder (dwasyl)
* Improved performance of sitemap generation (Levi Adler)
* StreamField now respects the `blank` setting; StreamBlock accepts a `required` setting (Loic Teixeira)
* StreamBlock now accepts `min_num`, `max_num` and `block_counts` settings to control the minimum and maximum numbers of blocks (Edwar Baron, Matt Westcott)
* Users can no longer remove their own active / superuser flags through Settings -> Users (Stein Strindhaug, Huub Bouma)
* The `process_form_submission` method of form pages now return the created form submission object (cho-leukeleu)
* Added `WAGTAILUSERS_PASSWORD_ENABLED` and `WAGTAILUSERS_PASSWORD_REQUIRED` settings to permit creating users with no Django-side passwords, to support external authentication setups (Matt Westcott)
* Added help text parameter to `DecimalBlock` and `RegexBlock` (Tomasz Knapik)
* Optimised caudal oscillation parameters on logo (Jack Paine)
* Fix: FieldBlocks in StreamField now call the field's `prepare_value` method (Tim Heap)
* Fix: Initial disabled state of InlinePanel add button is now set correctly on non-default tabs (Matthew Downey)
* Fix: Redirects with unicode characters now work (Rich Brennan)
* Fix: Prevent explorer view from crashing when page model definitions are missing, allowing the offending pages to be deleted (Matt Westcott)
* Fix: Hide the userbar from printed page representation (Eugene Morozov)
* Fix: Prevent the page editor footer content from collapsing into two lines unnecessarily (Jack Paine)
* Fix: StructBlock values no longer render HTML templates as their `str` representation, to prevent infinite loops in debugging / logging tools (Matt Westcott)
* Fix: Removed deprecated jQuery ``load`` call from TableBlock initialisation (Jack Paine)
* Fix: Position of options in mobile nav-menu (Jack Paine)
* Fix: Center page editor footer regardless of screen width (Jack Paine)
* Fix: Change the design of the navbar toggle icon so that it no longer obstructs page headers (Jack Paine)
* Fix: Document add/edit forms no longer render container elements for hidden fields (Jeffrey Chau)

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* Fix: Custom display page titles defined with `get_admin_display_title` are now shown within the page explorer menu (Matt Westcott, Janneke Janssen)