Add "why do you want to join" field to invite requests (#10524)

* Add "why do you want to join" field to invite requests

Fix #10512

* Remove unused translations

* Fix broken registrations when no invite request text is submitted

app/models/user.rb

@@ -74,6 +74,9 @@ class User < ApplicationRecord
   has_many :applications, class_name: 'Doorkeeper::Application', as: :owner
   has_many :backups, inverse_of: :user
 
+  has_one :invite_request, class_name: 'UserInviteRequest', inverse_of: :user, dependent: :destroy
+  accepts_nested_attributes_for :invite_request, reject_if: ->(attributes) { attributes['text'].blank? }
+
   validates :locale, inclusion: I18n.available_locales.map(&:to_s), if: :locale?
   validates_with BlacklistedEmailValidator, if: :email_changed?
   validates_with EmailMxValidator, if: :validate_email_dns?

app/models/user_invite_request.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: user_invite_requests
+#
+#  id         :bigint(8)        not null, primary key
+#  user_id    :bigint(8)
+#  text       :text
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class UserInviteRequest < ApplicationRecord
+  belongs_to :user, inverse_of: :invite_request
+  validates :text, presence: true, length: { maximum: 420 }
+end