Add "block drafts" feature

Design doc:
https://docs.google.com/document/d/16AX1tKa1CGSWwZtbW42h1uHy8SEPuv1ZjT_oHxc0UUI/edit

Fixed: twpowertools:84
Change-Id: Ibb172113774c5e2cab14e3d87a178bafed85df0b
diff --git a/src/static/_locales/en/messages.json b/src/static/_locales/en/messages.json
index 9b4ec2e..e9953e1 100644
--- a/src/static/_locales/en/messages.json
+++ b/src/static/_locales/en/messages.json
@@ -135,6 +135,10 @@
     "message": "Show the number of questions and replies written by the OP within the last <span id='profileindicatoralt_months--container'></span> months next to their username.",
     "description": "Feature checkbox in the options page"
   },
+  "options_blockdrafts": {
+    "message": "Block the sending of your replies as you type to Google servers in the Community Console.",
+    "description": "Feature checkbox in the options page"
+  },
   "options_save": {
     "message": "Save",
     "description": "Button in the options page to save the settings"
diff --git a/src/static/rulesets/blockDrafts.json b/src/static/rulesets/blockDrafts.json
new file mode 100644
index 0000000..1d58538
--- /dev/null
+++ b/src/static/rulesets/blockDrafts.json
@@ -0,0 +1,9 @@
+[{
+    "id": 1,
+    "action": {
+        "type": "block"
+    },
+    "condition": {
+        "urlFilter": "||support*.google.com/s/community/api/*DraftMessage"
+    }
+}]