Remove deprecated attributes from Poll::Question::Answer

Some fields from Poll::Question::Answer are translatable and we no
longer need them. This commit will remove the annoying deprecation
warning thrown by Globalize gem after gem version update.

db/migrate/20190221163117_remove_deprecated_translatable_fields_from_poll_question_answers.rb

@@ -0,0 +1,6 @@
+class RemoveDeprecatedTranslatableFieldsFromPollQuestionAnswers < ActiveRecord::Migration[4.2]
+  def change
+    remove_column :poll_question_answers, :title, :string
+    remove_column :poll_question_answers, :description, :text
+  end
+end

db/schema.rb

@@ -1146,8 +1146,6 @@ ActiveRecord::Schema.define(version: 20190607160900) do
   end
 
   create_table "poll_question_answers", force: :cascade do |t|
-    t.string  "title"
-    t.text    "description"
     t.integer "question_id"
     t.integer "given_order", default: 1
     t.boolean "most_voted",  default: false