Move remote translations controller methods to the model

Now that all the code related to this model is in the same place,
changing it will be easier.

app/controllers/remote_translations_controller.rb

@@ -2,34 +2,21 @@ class RemoteTranslationsController < ApplicationController
   skip_authorization_check
   respond_to :html, :js
 
-  before_action :set_remote_translations, only: :create
-
   def create
-    @remote_translations.each do |remote_translation|
-      RemoteTranslation.create!(remote_translation) unless translations_enqueued?(remote_translation)
-    end
+    RemoteTranslation.create_all(remote_translations_params)
+
     redirect_to request.referer, notice: t("remote_translations.create.enqueue_remote_translation")
   end
 
   private
 
     def remote_translations_params
-      params.permit(allowed_params)
-    end
-
-    def allowed_params
-      [:remote_translations]
-    end
-
-    def set_remote_translations
-      remote_translations = remote_translations_params["remote_translations"]
-      decoded_remote_translations = ActiveSupport::JSON.decode(remote_translations)
-      @remote_translations = decoded_remote_translations.map do |remote_translation|
-        remote_translation.slice("remote_translatable_id", "remote_translatable_type", "locale")
+      ActiveSupport::JSON.decode(params["remote_translations"]).map do |remote_translation_params|
+        remote_translation_params.slice(*allowed_params)
       end
     end
 
-    def translations_enqueued?(remote_translation)
-      RemoteTranslation.remote_translation_enqueued?(remote_translation)
+    def allowed_params
+      ["remote_translatable_id", "remote_translatable_type", "locale"]
     end
 end

app/models/remote_translation.rb

@@ -41,6 +41,12 @@ class RemoteTranslation < ApplicationRecord
     resource.class.translates? && resource.translations.where(locale: I18n.locale).empty?
   end
 
+  def self.create_all(remote_translations_params)
+    remote_translations_params.each do |remote_translation_params|
+      create!(remote_translation_params) unless remote_translation_enqueued?(remote_translation_params)
+    end
+  end
+
   def already_translated_resource
     if remote_translatable&.translations&.where(locale: locale).present?
       errors.add(:locale, :already_translated)