Add support for invite codes in the registration API (#27805)

config/locales/en.yml

@@ -1368,6 +1368,7 @@ en:
       '86400': 1 day
     expires_in_prompt: Never
     generate: Generate invite link
+    invalid: This invite is not valid
     invited_by: 'You were invited by:'
     max_uses:
       one: 1 use

config/routes.rb

@@ -81,6 +81,8 @@ Rails.application.routes.draw do
     resource :outbox, only: [:show], module: :activitypub
   end
 
+  get '/invite/:invite_code', constraints: ->(req) { req.format == :json }, to: 'api/v1/invites#show'
+
   devise_scope :user do
     get '/invite/:invite_code', to: 'auth/registrations#new', as: :public_invite