Reorganize share/export UI

"Image" and "Embeddable HTML" options move to share control.
Only XML export remains, and is now accessed via a sidebar
link rather than the tab bar.

config/locales/en.yml

@@ -980,8 +980,8 @@ en:
     view_tooltip: View the map
     edit: Edit
     history: History
-    export: Export
-    export_tooltip: Export map data
+    data: Data
+    export_data: Export Data
     gps_traces: GPS Traces
     gps_traces_tooltip: Manage GPS traces
     user_diaries: User Diaries
@@ -2039,9 +2039,19 @@ en:
     share:
       title: "Share"
       cancel: "Cancel"
+      image: "Image"
       link: "Link"
       short_link: "Short Link"
       long_link: "Long Link"
+      embed: "Embeddable HTML"
+      custom_dimensions: "Set custom dimensions"
+      format: "Format"
+      scale: "Scale"
+      image_size: "Image will show standard layer at "
+      download: "Download"
+      short_url: "Short URL"
+      include_marker: "Include marker"
+      paste_html: "Paste HTML to embed in website"
     key:
       title: "Map Key"
       tooltip: "Map Key"