Djangocms-bootstrap4

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* fix: container replace gettext_lazy with gettext by florianRepenn in https://github.com/django-cms/djangocms-bootstrap4/pull/164

**New Contributors**

* florianRepenn made their first contribution in https://github.com/django-cms/djangocms-bootstrap4/pull/164

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* fix: django import error by src-r-r in https://github.com/django-cms/djangocms-bootstrap4/pull/162
* ci: Bump wheel from 0.37.1 to 0.38.1 by dependabot in https://github.com/django-cms/djangocms-bootstrap4/pull/160

**New Contributors**

* src-r-r made their first contribution in https://github.com/django-cms/djangocms-bootstrap4/pull/162

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* Added support for djangocms-static-ace to serve the ace code editor locally
* Added support for Django 3.2
* Dropped support for Python 3.7
* Dropped support for Django 3.0 and 3.1

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* Added support for Django 3.1
* Dropped support for Python 2.7 and Python 3.4
* Dropped support for Django < 2.2
* Added support for sorl thumbnail
* Fixed CORS issues with external SVGs
* Fixed link preview not showing the correct icon
* Added documentation information about ``TEXT_SAVE_IMAGE_FUNCTION``

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* Added support for Django 3.0
* Added support for Python 3.8
* Pinned ``django-filer`` to 1.5.0
* Added further tests to raise coverage
* Fixed smaller issues found during testing
* Dropped support for django-filer <= 1.4

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* This update requires djangocms-link>=2.5.0
* This update requires djangocms-picture>=2.3.0
* Added new migrations for bootstrap link and picture plugins
* Fixes offset class not being rendered when set to 0
* Fixes order class not being rendered when set to 0