Revised road key and icons for data browser

config/key.yml

@@ -1,11 +1,9 @@
 mapnik:
   - { min_zoom: 0, max_zoom: 19, name: motorway, image: motorway.png }
-  - { min_zoom: 0, max_zoom: 11, name: trunk, image: trunk.png }
-  - { min_zoom: 12, max_zoom: 19, name: trunk, image: trunk12.png }
-  - { min_zoom: 7, max_zoom: 11, name: primary, image: primary.png }
-  - { min_zoom: 12, max_zoom: 19, name: primary, image: primary12.png }
-  - { min_zoom: 9, max_zoom: 11, name: secondary, image: secondary.png }
-  - { min_zoom: 12, max_zoom: 19, name: secondary, image: secondary12.png }
+  - { min_zoom: 0, max_zoom: 6, name: main_road, image: mainroad.png }
+  - { min_zoom: 7, max_zoom: 8, name: main_road, image: mainroad7.png }
+  - { min_zoom: 9, max_zoom: 11, name: main_road, image: mainroad9.png }
+  - { min_zoom: 12, max_zoom: 19, name: main_road, image: mainroad12.png }
   - { min_zoom: 13, max_zoom: 19, name: track, image: track.png }
   - { min_zoom: 13, max_zoom: 19, name: bridleway, image: bridleway.png }
   - { min_zoom: 13, max_zoom: 19, name: cycleway, image: cycleway.png }

config/locales/en.yml

@@ -1,4 +1,4 @@
-en:
+en:
   html:
     dir: ltr
   time:
@@ -1425,6 +1425,7 @@ en:
       table:
         entry:
           motorway: "Motorway"
+          main_road: "Main road"
           trunk: "Trunk road"
           primary: "Primary road"
           secondary: "Secondary road"