Directly select language in remotely translatable tests

The test "request a translation of an already translated text" was
failing sometimes on our CI since August 29, maybe due to a change in
GitHub Actions since the test had been passing for a year and a half and
we didn't change any code around that time (we were updating the
documentation). While the root cause is unknown, debugging shows that
sometimes (usually the first time this test is executed on our CI, and
only the first time, since running it 600 tests in a row also resulted
in only one failure) the request done by clicking on "Traducir página"
is done with a user session where the locale is in English.

This doesn't make much sense, since both user sessions are already in
Spanish (and we had either explicit or implicit expectations to confirm
that), and debugging shows that the session is indeed in Spanish during
the previous request.

In any case, we're solving it by never using English during the test,
since it wasn't necessary; it was only done that way because all the
tests on this file used the language selector to get to the Spanish
pages. We're simplifying some of the other tests the same way.

The test failure was:

```
Failure/Error: expect(page).to have_content "Se han solicitado
correctamente las traducciones"
expected to find text "Se han solicitado correctamente las traducciones"
in
"Idioma: \n
\nEnglish\nDeutsch\nEspañol\nFrançais\nNederlands\nPortuguês
brasileiro\n中文\n
Entrar\nRegistrarse\nDebates\nPropuestas\nVotaciones\nLegislación
colaborativa\nPresupuestos participativos\nODS\nAyuda\n×\nTranslations
have been correctly requested.\nPropuestas más activas\nAhora mismo no
hay propuestas\nDebates más activos\nndfrrqufrp\nVer todos los
debates\nProcesos abiertos\nAhora mismo no hay procesos
abiertos\nGobierno abierto\nEste portal usa la aplicación CONSUL
DEMOCRACY que es software de código abierto.\nParticipación\nDecide cómo
debe ser la ciudad que quieres.\nCONSUL DEMOCRACY, 2024 Política de
privacidad Condiciones de uso Accesibilidad"
```

Note that most of the text is in Spanish (as expected) but the flash
message itself is in English.

spec/shared/system/remotely_translatable.rb

@@ -5,6 +5,7 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
     path_arguments.transform_values { |path_to_value| resource.send(path_to_value) }
   end
   let(:path) { send(path_name, arguments) }
+  let(:path_in_spanish) { send(path_name, arguments.merge(locale: :es)) }
   let!(:resource) { create(factory_name) }
 
   before do
@@ -24,9 +25,7 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
     end
 
     scenario "should be present when current locale translation does not exists" do
-      visit path
-
-      select "Español", from: "Language:"
+      visit path_in_spanish
 
       expect(page).to have_button "Traducir página"
     end
@@ -44,20 +43,15 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
 
     scenario "should not be present when there are no resources to translate", if: index_path?(path_name) do
       resource.destroy!
-      visit path
+      visit path_in_spanish
 
-      select "Español", from: "Language:"
-
-      expect(page).to have_select "Idioma:"
       expect(page).not_to have_button "Traducir página"
     end
 
     describe "with delayed job active", :delay_jobs do
       scenario "should not be present when an equal RemoteTranslation is enqueued" do
         create(:remote_translation, remote_translatable: resource, locale: :es)
-        visit path
-
-        select "Español", from: "Language:"
+        visit path_in_spanish
 
         expect(page).to have_content "En un breve periodo de tiempo refrescando la página " \
                                      "podrá ver todo el contenido en su idioma"
@@ -136,8 +130,7 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
   context "After click remote translations button" do
     describe "with delayed jobs", :delay_jobs do
       scenario "shows informative text when content is enqueued" do
-        visit path
-        select "Español", from: "Language:"
+        visit path_in_spanish
 
         click_button "Traducir página"
 
@@ -159,10 +152,8 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
       scenario "content is immediately translated" do
         response = generate_response(resource)
         expect_any_instance_of(RemoteTranslations::Microsoft::Client).to receive(:call).and_return(response)
-        visit path
-        select "Español", from: "Language:"
+        visit path_in_spanish
 
-        expect(page).to have_select "Idioma:"
         expect(page).not_to have_content response.first
 
         click_button "Traducir página"
@@ -176,15 +167,13 @@ shared_examples "remotely_translatable" do |factory_name, path_name, path_argume
         expect_any_instance_of(RemoteTranslations::Microsoft::Client).to receive(:call).and_return(response)
 
         in_browser(:one) do
-          visit path
-          select "Español", from: "Language:"
+          visit path_in_spanish
 
           expect(page).to have_button "Traducir página"
         end
 
         in_browser(:two) do
-          visit path
-          select "Español", from: "Language:"
+          visit path_in_spanish
           click_button "Traducir página"
 
           expect(page).to have_content "Se han solicitado correctamente las traducciones"