Drop base layer blurb, tighten vertical space

app/assets/javascripts/leaflet.layers.js

@@ -35,10 +35,6 @@ L.OSM.layers = function(options) {
       .attr('class', 'section base-layers')
       .appendTo($ui);
 
-    $('<p>')
-      .text(I18n.t('javascripts.map.layers.base'))
-      .appendTo(baseSection);
-
     list = $('<ul>')
       .appendTo(baseSection);
 

app/assets/stylesheets/common.css.scss

@@ -603,6 +603,10 @@ a.donate {
 }
 
 .layers-ui {
+  ul, li:last-child {
+    margin-bottom: 0;
+  }
+
   li {
     border-radius: 4px;
     overflow: hidden;

config/locales/en.yml

@@ -2061,7 +2061,6 @@ en:
         notes: Map Notes
         data: Map Data
         overlays: Enable overlays for troubleshooting the map
-        base: OSM provides the underlying data for all these maps
     site:
       edit_tooltip: Edit the map
       edit_disabled_tooltip: Zoom in to edit the map