Changelog: add Admin changes for 5.2.0 release

Author: greenrobot-team

CHANGELOG.md

@@ -2,13 +2,17 @@
 
 Notable changes to the ObjectBox Java library.
 
-For more insights into what changed in the ObjectBox C++ core, [check the ObjectBox C changelog](https://github.com/objectbox/objectbox-c/blob/main/CHANGELOG.md).
+For more insights into what changed in the database libraries, [check the ObjectBox C changelog](https://github.com/objectbox/objectbox-c/blob/main/CHANGELOG.md).
 
 ## 5.2.0 - 2026-02-16
 
 - The [ObjectBox Gradle plugin](https://github.com/objectbox/objectbox-java-generator) requires JDK 11 and Android
   Gradle Plugin 8.1 or newer.
 - Update database libraries for Android and JVM to database version `5.1.1-pre-2026-02-16`.
+- Admin: new "Counts and Sizes" view (via Status page) to give an overview over all types their object counts and sizes
+- Admin: fix reload via browser to stay on the page
+- Admin: schema view to display flags as text
+- Admin: refresh button for the data view
 
 ### Sync