adblockplusopera: Port UI code from Chrome

locales/en-GB/messages.json

+{
+  "filters_acceptableAds2_label": {
+    "message": "Allow some non-intrusive advertising"
+  },
+  "filters_addSubscriptionAdd_label": {
+    "message": "Add"
+  },
+  "filters_addSubscriptionOther_label": {
+    "message": "Add a different subscription"
+  },
+  "filters_addSubscription_label": {
+    "message": "Add filter subscription"
+  },
+  "filters_readMore_label": {
+    "message": "Read more"
+  },
+  "filters_subscription_delete_label": {
+    "message": "Delete"
+  },
+  "filters_subscription_enabled_label": {
+    "message": "Enabled"
+  },
+  "filters_subscription_lastDownload_checksumMismatch": {
+    "message": "Failed: checksum mismatch"
+  },
+  "filters_subscription_lastDownload_connectionError": {
+    "message": "Failed: download failure"
+  },
+  "filters_subscription_lastDownload_inProgress": {
+    "message": "Downloading..."
+  },
+  "filters_subscription_lastDownload_invalidData": {
+    "message": "Failed: not a valid filters list"
+  },
+  "filters_subscription_lastDownload_invalidURL": {
+    "message": "Failed: not a valid address"
+  },
+  "filters_viewList_label": {
+    "message": "View list"
+  },
+  "global_remove_subscription_warning": {
+    "message": "Do you really want to remove this subscription?"
+  },
+  "global_subscription_invalid_location": {
+    "message": "Filter list location is neither a valid URL nor a valid file name."
+  },
+  "name": {
+    "message": "Adblock Plus"
+  },
+  "overlay_hideplaceholders_label": {
+    "message": "Hide placeholders of blocked elements"
+  },
+  "subscriptionSelection_location_label": {
+    "message": "Filter list location:"
+  },
+  "subscriptionSelection_subscriptionSelector_label": {
+    "message": "Please choose a filter subscription from the list:"
+  },
+  "subscriptionSelection_title_label": {
+    "message": "Subscription title:"
+  }
+}