Allow arrays of names in map key entries

app/controllers/site_controller.rb

@@ -50,6 +50,9 @@ class SiteController < ApplicationController
     expires_in 7.days, :public => true
     @key = YAML.load_file(Rails.root.join("config/key.yml"))
     @key.each_value do |layer_data|
+      layer_data.each do |entry|
+        entry["name"] = Array(entry["name"])
+      end
       layer_data.each_cons(2) do |entry, next_entry|
         entry["max_zoom"] = next_entry["min_zoom"] - 1 if entry["name"] == next_entry["name"] && !entry["max_zoom"] && next_entry["min_zoom"]
       end

app/views/site/key.html.erb

@@ -11,7 +11,7 @@
             <% end %>
           </td>
           <td>
-            <%= Array(t(".table.entry.#{entry['name']}")).to_sentence %>
+            <%= entry["name"].map { |feature_name| t ".table.entry.#{feature_name}" }.join(" · ") %>
           </td>
         <% end %>
       <% end %>