docs(changelog): Simplified Chinese (#1298)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

changelog.d/1298-simplified-chinese.md

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+- Add Simplified Chinese (zh-CN) as an interface language, selectable from
+  the globe picker. The catalog builds on the Chinese translations by
+  abiyeenzo (#914) and EDIT-Aeterna (#979); the rest was translated and the
+  whole catalog reviewed against the screens. Chinese text gets tight tracking
+  and readable minimum sizes, and year-first dates read 2021年10月16日
+  (German, @gekh, #1298).