Fix .more-fields string

data/core.yaml

@@ -227,6 +227,7 @@ en:
     way: Way
     relation: Relation
     location: Location
+    add_fields: Add additional fields
   background:
     title: Background
     description: Background settings

dist/locales/en.json

@@ -278,7 +278,8 @@
         "node": "Node",
         "way": "Way",
         "relation": "Relation",
-        "location": "Location"
+        "location": "Location",
+        "add_fields": "Add additional fields"
     },
     "background": {
         "title": "Background",

js/id/ui/preset.js

@@ -170,7 +170,7 @@ iD.ui.preset = function(context) {
         $more.enter().append('div')
             .attr('class', 'more-fields')
             .append('label')
-                .text('Add additional fields');
+                .text(t('inspector.add_fields'));
 
         var $input = $more.selectAll('.value')
             .data([0]);