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/features/admin/budget_phases_spec.rb

@@ -14,8 +14,8 @@ describe "Admin budget phases" do
 
       fill_in "start_date", with: Date.current + 1.day
       fill_in "end_date", with: Date.current + 12.days
-      fill_in_translatable_ckeditor "summary", :en, with: "New summary of the phase."
-      fill_in_translatable_ckeditor "description", :en, with: "New description of the phase."
+      fill_in_ckeditor "Summary", with: "New summary of the phase."
+      fill_in_ckeditor "Description", with: "New description of the phase."
       uncheck "budget_phase_enabled"
       click_button "Save changes"
 

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