Simplify CKEditor translatable fields in specs

We've simplified the way CKEditor is handled in tests; probably due to
that, we don't need this method anymore.

spec/support/common_actions/verifications.rb

@@ -44,12 +44,6 @@ module Verifications
     end
   end
 
-  def fill_in_translatable_ckeditor(field, locale, params = {})
-    selector = ".translatable-fields[data-locale='#{locale}'] textarea[id$='_#{field}']"
-    locator = find(selector, visible: false)[:id]
-    fill_in_ckeditor(locator, params)
-  end
-
   # @param [String] locator label text for the textarea or textarea id
   def fill_in_ckeditor(locator, params = {})
     # Find out ckeditor id at runtime using its label