Added GitHub reference to changelog entry

Author: ddabble

CHANGES.rst

@@ -6,7 +6,7 @@ Unreleased
 
 - Added support for Python 3.14
 - Added support for Django 6.0
-- Added Ukrainian localization
+- Added Ukrainian localization (gh-1547)
 
 3.10.1 (2025-06-20)
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