Add locale codes to version control (#501)

fixes frontend build issue

frontend/.gitignore

@@ -24,7 +24,7 @@
 .env.*.local
 
 # translation files
-src/__generated__/**/*.ts
+src/__generated__/locales/*.ts
 xliff/*.xlf
 
 storybook-static

frontend/src/__generated__/locale-codes.ts

@@ -0,0 +1,23 @@
+// Do not modify this file by hand!
+// Re-generate this file by running lit-localize.
+
+/**
+ * The locale code that templates in this source code are written in.
+ */
+export const sourceLocale = `en`;
+
+/**
+ * The other locale codes that this application is localized into. Sorted
+ * lexicographically.
+ */
+export const targetLocales = [
+  `en-US`,
+] as const;
+
+/**
+ * All valid project locale codes. Sorted lexicographically.
+ */
+export const allLocales = [
+  `en`,
+  `en-US`,
+] as const;