Adding layer_title to Map JSON (refs #353)

app/views/maps/_map.json.jbuilder

@@ -6,7 +6,7 @@ json.layers map.layers do |layer|
   json.extract! layer, :id, :title, :subtitle, :text, :credits, :image_link, :published, :map_id, :color, :relations_bending, :relations_coloring, :image_alt, :image_licence, :image_source, :image_creator, :image_caption, :created_at, :updated_at, :ltype
   json.iconset layer.map.iconset, :title, :icon_anchor, :icon_size, :popup_anchor, :class_name if layer.map.iconset
   json.places layer.places do |place|
-    json.extract! place, :id, :title, :subtitle, :teaser, :text, :sources, :link, :startdate, :enddate, :full_address, :location, :address, :zip, :city, :country, :published, :featured, :shy, :layer_id, :layer_color, :layer_type, :created_at, :updated_at, :date, :edit_link, :show_link, :imagelink2, :imagelink, :icon_link, :icon_class, :icon_name
+    json.extract! place, :id, :title, :subtitle, :teaser, :text, :sources, :link, :startdate, :enddate, :full_address, :location, :address, :zip, :city, :country, :published, :featured, :shy, :layer_id, :layer_title, :layer_color, :layer_type, :created_at, :updated_at, :date, :edit_link, :show_link, :imagelink2, :imagelink, :icon_link, :icon_class, :icon_name
     json.lat place.public_lat
     json.lon place.public_lon
     json.annotations place.annotations do |annotation|