adds trail difficulty property

web/src/lib/i18n/locales/en.json

@@ -28,10 +28,13 @@
   "delete-trail-confirm": "Do you really want to delete this trail? This action cannot be undone.",
   "describe-your-trail": "Describe your trail",
   "description": "Description",
+  "difficult": "Difficult",
+  "difficulty": "Difficulty",
   "directions": "Directions",
   "display-as": "Display as",
   "distance": "Distance",
   "download-gpx": "Download GPX",
+  "easy": "Easy",
   "edit": "Edit",
   "edit-entry": "Edit Entry",
   "edit-list": "Edit List",
@@ -61,6 +64,7 @@
   "make-thumbnail": "Make thumbnail",
   "map": "Map",
   "metric": "Metric",
+  "moderate": "Moderate",
   "name": "Name",
   "near": "Near",
   "new-list": "New List",