Reduce locales used in remote translations tests

This way we can reduce the number of locales used in the test
environment as well, while still testing every possible scenario for
remote translations.

spec/features/remote_translations_spec.rb

@@ -5,8 +5,7 @@
   before do
     Setting["feature.remote_translations"] = true
     create(:proposal)
-    available_locales_response = ["ar", "de", "en", "es", "fa", "fr", "he", "it", "nl", "pl",
-                                  "pt", "sv", "zh-Hans", "zh-Hant"]
+    available_locales_response = %w[de en es fr pt zh-Hans]
     expect(RemoteTranslations::Microsoft::AvailableLocales).to receive(:available_locales).
                                                             and_return(available_locales_response)
   end
@@ -27,18 +26,14 @@
       end
 
       scenario "should display text in English" do
-        available_locales_with_fallback_en = [:ar, :de, :fa, :he, :nl, :pl, :sv]
-
-        visit root_path(locale: available_locales_with_fallback_en.sample)
+        visit root_path(locale: :de)
 
         expect(page).to have_css ".remote-translations-button"
         expect(page).to have_content "The content of this page is not available in your language"
       end
 
       scenario "should display text in English after parse key" do
-        available_locales_with_fallback_en = [:"zh-CN", :"zh-TW"]
-
-        visit root_path(locale: available_locales_with_fallback_en.sample)
+        visit root_path(locale: :"zh-CN")
 
         expect(page).to have_css ".remote-translations-button"
         expect(page).to have_content "The content of this page is not available in your language"
@@ -53,9 +48,7 @@
       end
 
       scenario "with locale that has :es fallback" do
-        available_locales_with_fallback_es = [:es, :fr, :it]
-
-        visit root_path(locale: available_locales_with_fallback_es.sample)
+        visit root_path(locale: :fr)
 
         expect(page).to have_css ".remote-translations-button"
         expect(page).to have_content "El contenido de esta página no está disponible en tu idioma"
@@ -72,9 +65,7 @@
   end
 
   scenario "Not display remote translation button when locale is not included in microsoft translate client" do
-    not_available_locales = [:val, :gl, :sq]
-
-    visit root_path(locale: not_available_locales.sample)
+    visit root_path(locale: :nl)
 
     expect(page).not_to have_css ".remote-translations-button"
   end