Add ARIA label and description to settings fields

These fields have no label associated to them. While it's more or less
obvious for sighted users that these fields are associated with the
table cell next to them, visually impaired users might not get that
association when using the screen reader in forms mode.

Note we're using `aria-label` instead of `aria-labelledby`. IMHO in this
case `aria-labelledby` is the superior method because it guarantees the
text is present for both sighted and visually impaired users. However,
testing for fields with no label other than the one provided by
`aria-labelledby` is hard since Capybara has no support for this
attribute.

So we're using `aria-label` and testing the presence of the text on the
page (with the `within "tr", text:` statements) as well as the ARIA
label (with the `fill_in` statements).

app/views/admin/settings/_settings_form.html.erb

@@ -1,7 +1,11 @@
 <%= form_for([:admin, setting]) do |f| %>
   <%= f.hidden_field :tab, id: dom_id(setting, :tab), value: tab if defined?(tab) %>
   <div class="small-12 medium-6 large-8 column">
-    <%= f.text_area :value, label: false, id: dom_id(setting, :value) %>
+    <%= f.text_area :value,
+      label: false,
+      id: dom_id(setting, :value),
+      "aria-label": strip_tags(t("settings.#{setting.key}")),
+      "aria-describedby": dom_id(setting, :description) %>
   </div>
   <div class="small-12 medium-6 large-4 column">
     <%= f.submit(t("admin.settings.index.update_setting"), class: "button hollow expanded") %>

app/views/admin/settings/_settings_table.html.erb

@@ -11,7 +11,7 @@
         <td class="small-6">
           <strong><%= t("settings.#{setting.key}") %></strong>
           <br>
-          <span class="small">
+          <span id="<%= dom_id(setting, :description) %>" class="small">
             <%= t("settings.#{setting.key}_description", default: t("admin.settings.no_description")) %>
           </span>
         </td>

spec/system/admin/settings_spec.rb

@@ -14,12 +14,12 @@ describe "Admin settings", :admin do
   end
 
   scenario "Update" do
-    setting = create(:setting, key: "super.users.first")
+    create(:setting, key: "super.users.first")
 
     visit admin_settings_path
 
-    within("#edit_setting_#{setting.id}") do
-      fill_in "value_setting_#{setting.id}", with: "Super Users of level 1"
+    within "tr", text: "First" do
+      fill_in "First", with: "Super Users of level 1"
       click_button "Update"
     end
 
@@ -173,13 +173,13 @@ describe "Admin settings", :admin do
       end
 
       scenario "On #tab-remote-census-configuration" do
-        remote_census_setting = create(:setting, key: "remote_census.general.whatever")
+        create(:setting, key: "remote_census.general.whatever")
 
         visit admin_settings_path
         find("#remote-census-tab").click
 
-        within("#edit_setting_#{remote_census_setting.id}") do
-          fill_in "value_setting_#{remote_census_setting.id}", with: "New value"
+        within "tr", text: "Whatever" do
+          fill_in "Whatever", with: "New value"
           click_button "Update"
         end
 
@@ -189,13 +189,13 @@ describe "Admin settings", :admin do
     end
 
     scenario "On #tab-configuration" do
-      configuration_setting = Setting.create!(key: "whatever")
+      Setting.create!(key: "whatever")
 
       visit admin_settings_path
       find("#tab-configuration").click
 
-      within("#edit_setting_#{configuration_setting.id}") do
-        fill_in "value_setting_#{configuration_setting.id}", with: "New value"
+      within "tr", text: "Whatever" do
+        fill_in "Whatever", with: "New value"
         click_button "Update"
       end
 
@@ -209,13 +209,13 @@ describe "Admin settings", :admin do
       end
 
       scenario "On #tab-map-configuration" do
-        map_setting = Setting.create!(key: "map.whatever")
+        Setting.create!(key: "map.whatever")
 
         visit admin_settings_path
         click_link "Map configuration"
 
-        within("#edit_setting_#{map_setting.id}") do
-          fill_in "value_setting_#{map_setting.id}", with: "New value"
+        within "tr", text: "Whatever" do
+          fill_in "Whatever", with: "New value"
           click_button "Update"
         end
 
@@ -225,13 +225,13 @@ describe "Admin settings", :admin do
     end
 
     scenario "On #tab-proposals" do
-      proposal_dashboard_setting = Setting.create!(key: "proposals.whatever")
+      Setting.create!(key: "proposals.whatever")
 
       visit admin_settings_path
       find("#proposals-tab").click
 
-      within("#edit_setting_#{proposal_dashboard_setting.id}") do
-        fill_in "value_setting_#{proposal_dashboard_setting.id}", with: "New value"
+      within "tr", text: "Whatever" do
+        fill_in "Whatever", with: "New value"
         click_button "Update"
       end