5.2.3 release

5.2.3 release 

Fixes 

• SQL Engine: Support for Google Protobuf schema with references
• Kafka ACL: Create ACL action does not give a Javascript error
• Schema Registry: The user interface handles schema subject name containing /, usually found as part of Google Protobuf schema with references.
• Topic Configuration: Editing a configuration entry jumps the pagination to the first page and hides the popup dialog editing the value