diff --git a/website/server/controllers/api-v3/i18n.js b/website/server/controllers/api-v3/i18n.js
index 505df9b0fa..de6cfddebb 100644
--- a/website/server/controllers/api-v3/i18n.js
+++ b/website/server/controllers/api-v3/i18n.js
@@ -16,7 +16,7 @@ function geti18nBrowserScript (language) {
     availableLanguages,
     language,
     strings: translations[langCode],
-    momentLang: momentLangs[language.momentLangCode],
+    momentLang: momentLangs[langCode],
   })};
   })()`;
 }
diff --git a/website/server/libs/i18n.js b/website/server/libs/i18n.js
index 85c74df272..72c591f3ed 100644
--- a/website/server/libs/i18n.js
+++ b/website/server/libs/i18n.js
@@ -16,6 +16,7 @@ let momentLangsMapping = {
   en_GB: 'en-gb', // eslint-disable-line camelcase
   no: 'nn',
   zh: 'zh-cn',
+  zh_TW: 'zh-tw', // eslint-disable-line camelcase
   es_419: 'es', // eslint-disable-line camelcase
   pt_BR: 'pt-br', // eslint-disable-line camelcase
 };