fix: Guard unset language

app/components/Authenticated.js

@@ -20,7 +20,7 @@ const Authenticated = ({ children }: Props) => {
   // Watching for language changes here as this is the earliest point we have
   // the user available and means we can start loading translations faster
   React.useEffect(() => {
-    if (i18n.language !== language) {
+    if (language && i18n.language !== language) {
       // Languages are stored in en_US format in the database, however the
       // frontend translation framework (i18next) expects en-US
       i18n.changeLanguage(language.replace("_", "-"));