Use labels in nested option fields

We were using a placeholder, which is way less accessible than a label.

One issue here (which also happened before, but is now more obvious) is
that, when adding several options, there will be many fields with the
same label.

Another issue is that, for some languages, we're using texts like "Add a
closed answer", which might be confusing because we might be editing an
existing answer. The proper solution would probably be using the text
"Option 1", "Option 2", ... I'm not doing so right now because I'm not
sure that's a good option and because changing the text would mean
losing the existing translations.

app/views/admin/legislation/questions/_question_option_fields.html.erb

@@ -3,8 +3,7 @@
     <div class="small-12 medium-9 column">
       <%= f.translatable_fields do |translations_form| %>
         <%= translations_form.text_field :value,
-                                         placeholder: t("admin.legislation.questions.form.value_placeholder"),
+                                         label: t("admin.legislation.questions.form.value_placeholder") %>
-                                         label: false %>
       <% end %>
     </div>
 

spec/system/admin/legislation/questions_spec.rb

@@ -107,7 +107,7 @@ describe "Admin legislation questions", :admin do
       create(:legislation_question_option, question: question, value: "Original")
 
       visit edit_question_url
-      find("#nested_question_options input").set("Changed")
+      fill_in "Add a closed answer", with: "Changed"
       click_button "Save changes"
 
       expect(page).to have_content "Question updated successfully"
@@ -154,11 +154,11 @@ describe "Admin legislation questions", :admin do
 
         click_link "Add option"
 
-        find("#nested_question_options input").set("Option 1")
+        fill_in "Add a closed answer", with: "Option 1"
 
         select "Español", from: "Current language"
 
-        find("#nested_question_options input").set("Opción 1")
+        fill_in "Add a closed answer", with: "Opción 1"
 
         click_button "Save changes"
 
@@ -180,11 +180,11 @@ describe "Admin legislation questions", :admin do
 
         click_link "Add option"
 
-        find("#nested_question_options input").set("Opción 1")
+        fill_in "Add a closed answer", with: "Opción 1"
 
         select "English", from: "Current language"
 
-        find("#nested_question_options input").set("Option 1")
+        fill_in "Add a closed answer", with: "Option 1"
 
         click_button "Save changes"