Merged in fix/BOOK-399-default-language (pull request #2877)

fix(BOOK-399): Default language to 'en' when we've ended up in a invalid state

* fix(BOOK-399): Default language to 'en' when we've ended up in a invalid state

* PR fixes: reuse types and include local dev error message


Approved-by: Anton Gunnarsson
Approved-by: Linus Flood

apps/partner-sas/i18n/index.ts

@@ -13,6 +13,10 @@ const cache = createIntlCache()
 const instances: Partial<Record<Lang, IntlShape>> = {}
 
 export async function getMessages(lang: Lang): Promise<Record<string, string>> {
+  if (!Lang[lang]) {
+    lang = Lang.en
+  }
+
   return (await import(`./dictionaries/${lang}.json`)).default
 }