Show map color scheme on user preferences page

app/views/preferences/show.html.erb

@@ -25,6 +25,11 @@
   <dd class="col-sm-8">
     <%= t ".site_color_schemes.#{preferred_color_scheme(:site)}" %>
   </dd>
+
+  <dt class="col-sm-4"><%= t ".preferred_map_color_scheme" %></dt>
+  <dd class="col-sm-8">
+    <%= t ".map_color_schemes.#{preferred_color_scheme(:map)}" %>
+  </dd>
 </dl>
 
 <div>

config/locales/en.yml

@@ -1812,6 +1812,11 @@ en:
         auto: Auto
         light: Light
         dark: Dark
+      preferred_map_color_scheme: Preferred Map Color Scheme
+      map_color_schemes:
+        auto: Auto
+        light: Light
+        dark: Dark
       edit_preferences: Edit Preferences
     edit:
       title: Edit Preferences