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