Fix: Changlog for #578 (#621)

Author: fsbraun

CHANGELOG.rst

@@ -7,6 +7,7 @@ Unreleased
 
 * Removed inline editing toggle button from touch devices (where it is inactive anyways) and collapsed menus
 * Add workaround for toolbar bug in django CMS < 3.10: Reload page after change in inline editor
+* Fix #578: If parent plugins to not set body css class the default from CKEDITOR_SETTINGS is used
 
 5.1.0 (2022-03-24)
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