Wagtail

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* Fix: Un-pin django-treebeard following upstream fix for migration issue (Matt Westcott)
* Fix: Prevent crash when copying an alias page (Karl Hobley)
* Fix: Prevent errors on page editing after changing LANGUAGE_CODE (Matt Westcott)
* Fix: Correctly handle model inheritance and `ClusterableModel` on `copy_for_translation` (Karl Hobley)

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* Fix: Pin django-treebeard to <4.5 to prevent migration conflicts (Matt Westcott)

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* Fix: Prevent delete button showing on collection / workflow edit views when delete permission is absent (Helder Correia)
* Fix: Ensure aliases are published when the source page is published (Karl Hobley)
* Fix: Make page privacy rules apply to aliases (Karl Hobley)

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* Fix: Updated project template migrations to ensure that initial homepage creation runs before addition of locale field (Dan Braghis)
* Fix: Restore ability to use translatable strings in `LANGUAGES` / `WAGTAIL_CONTENT_LANGUAGES` settings (Andreas Morgenstern)
* Fix: Allow `locale` / `translation_of` API filters to be used in combination with search (Matt Westcott)
* Fix: Prevent error on `create_log_entries_from_revisions` when checking publish state on a revision that cannot be restored (Kristin Riebe)

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* Add custom finder to support Instagram oEmbed API (Luis Nell)
* Add custom finder to support Facebook oEmbed API (Cynthia Kiser)
* Fix: Improve performance of permission check on translations for edit page (Karl Hobley)
* Fix: Gracefully handle missing Locale records on `Locale.get_active` and `.localized` (Matt Westcott)
* Fix: Handle `get_supported_language_variant` returning a language variant not in `LANGUAGES` (Matt Westcott)
* Fix: Reinstate missing icon on settings edit view (Jérôme Lebleu)
* Fix: Avoid performance and pagination logic issues with a large number of languages (Karl Hobley)
* Fix: Allow deleting the default locale (Matt Westcott)

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* Fix: Ensure that cached `wagtail_site_root_paths` structures from older Wagtail versions are invalidated (Sævar Öfjörð Magnússon)
* Fix: Avoid circular import between wagtail.admin.auth and custom user models (Matt Westcott)
* Fix: Prevent error on resolving page URLs when a locale outside of `WAGTAIL_CONTENT_LANGUAGES` is active (Matt Westcott)