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* Adds breadcrump support by adding a CMSAttachMenu. NOTE: django CMS v3.0.14
or v3.1 or later must be used to have working breadcrumbs.
* Adds support for swappable User models.
* Adds sitemaps support.
* Improves support of language fallbacks as defined in CMS_LANGUAGES
* Adds new app configuration option for setting a template prefix.
* Fix an error in search indexer that breaks indexing if an article has no
search data
* Search indexer is using switch_language from parler
* Now requires aldryn-apphooks-config v0.2.4 or later