changelog: HUD summary language (#1488)

changelog.d/1488-hud-summary-language.md

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+- Write the AI HUD summary in the interface language. The model now returns
+  the feed state as its own field, and the HUD checks it against its own and
+  adds its translated state tag, so a stale or partial view is never shown as
+  live. A partial layer no longer reads as off or nominal in the HUD, voice
+  and analyst provenance (German, @gekh, #1488).