Update changelog

CHANGELOG.md

@@ -9,9 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Harmonized the data format of the export functionality
 - Improved the language localization for German (`de`)
 - Upgraded `prisma` from version `7.8.0` to `7.9.1`
 
+### Fixed
+
+- Fixed the export functionality to only include the accounts of the exported activities if a filter is applied
+
 ## 3.38.0 - 2026-07-31
 
 ### Added