feat: improved registration signup flow (#1188)

refactored signup flow for entire registration process. Utilized seed data option for optional seeding of Foods, Units, and Labels. Localized registration page.

frontend/types/api-types/user.ts

@@ -28,6 +28,8 @@ export interface CreateUserRegistration {
   passwordConfirm: string;
   advanced?: boolean;
   private?: boolean;
+  seedData?: boolean;
+  locale?: string;
 }
 export interface ForgotPassword {
   email: string;