Enable RSpec/RepeatedExample cop & fix all issues

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/RepeatedExample

spec/features/emails_spec.rb

@@ -210,15 +210,6 @@ feature 'Emails' do
     end
   end
 
-  scenario "Email depending on user's locale" do
-    sign_up
-
-    email = open_last_email
-    expect(email).to have_subject('Confirmation instructions')
-    expect(email).to deliver_to('manuela@consul.dev')
-    expect(email).to have_body_text(user_confirmation_path)
-  end
-
   scenario "Email on unfeasible spending proposal" do
     Setting["feature.spending_proposals"] = true