Add Chinese Simplified (#1990)

* Add Chinese Simplified

* fix formatting

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Co-authored-by: Bernd Storath <999999bst@gmail.com>

src/i18n/i18n.config.ts

@@ -3,6 +3,7 @@ import uk from './locales/uk.json';
 import fr from './locales/fr.json';
 import de from './locales/de.json';
 import zhhk from './locales/zh-HK.json';
+import zhcn from './locales/zh-CN.json';
 
 export default defineI18nConfig(() => ({
   legacy: false,
@@ -13,5 +14,6 @@ export default defineI18nConfig(() => ({
     fr,
     de,
     'zh-HK': zhhk,
+    'zh-CN': zhcn,
   },
 }));