design enhancements..

* replace full width bottom bar with subtle list item
* move hidden feature details to list item tooltip
* simplify some of the text labels on the Map Data panel
* progressively hide some footer elements with media queries

data/core.yaml

@@ -181,7 +181,8 @@ en:
   loading_auth: "Connecting to OpenStreetMap..."
   report_a_bug: report a bug
   feature_info:
-    hidden_features: "Hidden: {features}"
+    hidden_warning: "{count} hidden features"
+    hidden_details: "These features are currently hidden: {details}"
   status:
     error: Unable to connect to API.
     offline: The API is offline. Please try editing later.
@@ -250,9 +251,9 @@ en:
   map_data:
     title: Map Data
     description: Map Data
-    show_features: Show Map Features
-    show_layers: Show Data Layers
+    data_layers: Data Layers
     fill_area: Fill Areas
+    map_features: Map Features
     autohidden: "These features have been automatically hidden because too many would be shown on the screen.  You can zoom in to edit them."
   feature:
     points: