Remove ineffective test

It would pass even if locales were broken.

spec/support/request/web_helper.rb

@@ -27,10 +27,6 @@ module WebHelper
     yield
   end
 
-  def set_i18n_locale(locale = 'en')
-    page.execute_script("I18n.locale = '#{locale}'")
-  end
-
   def pick_i18n_locale
     page.evaluate_script("I18n.locale;")
   end

spec/system/consumer/multilingual_spec.rb

@@ -15,13 +15,6 @@ RSpec.describe 'Multilingual' do
     expect(Rails.application.config.i18n[:available_locales]).to eq ['en', 'es', 'pt']
   end
 
-  it '18n-js fallsback to default language' do
-    # in backend it doesn't until we change enforce_available_locales to `true`
-    visit root_path
-    set_i18n_locale('it')
-    expect(get_i18n_translation('label_shops')).to eq 'Shops'
-  end
-
   context 'can switch language by params' do
     it 'in root path' do
       visit root_path