Feature: Chinese Traditional translation (#9076)

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src-ui/src/app/services/settings.service.ts

@@ -244,6 +244,12 @@ const LANGUAGE_OPTIONS = [
     englishName: 'Chinese Simplified',
     dateInputFormat: 'yyyy-mm-dd',
   },
+  {
+    code: 'zh-tw',
+    name: $localize`Chinese Traditional`,
+    englishName: 'Chinese Traditional',
+    dateInputFormat: 'yyyy/mm/dd',
+  },
 ]
 
 const ISO_LANGUAGE_OPTION: LanguageOption = {