adds comments labels per comment

fixes #265

spec/support/common_actions.rb

@@ -30,7 +30,7 @@ module CommonActions
     login_as(user2)
     visit debate_path(debate)
 
-    fill_in 'comment_body', with: 'Have you thought about...?'
+    fill_in "comment-body-debate_#{debate.id}", with: 'Have you thought about...?'
     click_button 'Publish comment'
     expect(page).to have_content 'Have you thought about...?'
   end
@@ -45,7 +45,7 @@ module CommonActions
 
     click_link "Reply"
     within "#js-comment-form-comment_#{comment.id}" do
-      fill_in 'comment_body', with: 'It will be done next week.'
+      fill_in "comment-body-comment_#{comment.id}", with: 'It will be done next week.'
       click_button 'Publish reply'
     end
     expect(page).to have_content 'It will be done next week.'