fix(client): update navbar for Chinese Simplified and Traditional (#42007)

* fix: navbar bug

Should resolve the current bug on staging with the nav bar.

* fix: update display names

Update the display names for the two Chinese options.

* fix(tools): remove extraneous test

Docs do not indicate that language code needs to be 2 characters.

config/i18n/all-langs.js

@@ -16,15 +16,15 @@ const i18nextCodes = {
   english: 'en',
   espanol: 'es',
   chinese: 'zh',
-  'chinese-traditional': 'zh'
+  'chinese-traditional': 'zh-Hant'
 };
 
 // These are for the language selector dropdown menu in the footer
 const langDisplayNames = {
   english: 'English',
   espanol: 'Español',
-  chinese: '中文',
-  'chinese-traditional': '古文'
+  chinese: '中文（简体字）',
+  'chinese-traditional': '中文（繁體字）'
 };
 
 /* These are for formatting dates and numbers. Used with JS .toLocaleString().