fix(i18n): complete Simplified Chinese core and plugin translations (#1542)

* fix(i18n): complete Chinese onboarding and navigation labels

* fix(i18n): translate remaining Chinese core and plugin interfaces

* fix(i18n): translate host editor tab overflow controls

* fix(i18n): use consistent Chinese fleet terminology

* fix(i18n): localize hardcoded controls and plugin views

* fix(i18n): translate built-in homepage widget catalog

* test(homepage): follow translated timezone placeholder

* fix(i18n): translate plugin-provided homepage widgets

* fix(i18n): localize feature settings section titles

plugins/homepage/src/frontend/dialogs/WeatherEditForm.tsx

@@ -17,7 +17,7 @@ export function WeatherEditForm({
         <Input
           value={config.location}
           onChange={(e) => onChange({ ...config, location: e.target.value })}
-          placeholder="New York, London, Tokyo..."
+          placeholder={t("homepage.locationPlaceholder")}
           className="h-8 text-sm"
         />
       </div>