Confirmaton on send, banner when 'unverified'

Not yet using the new APIs, but ready to. Still to do:
- Send sync messages on trust decisions
- Respond to received trust decision sync messages
- Show trust decisions in the conversation history
- In that rare situation where a sent message ends up with a key error
  make it easy to retry the send.

FREEBIE

js/views/confirmation_dialog_view.js

@@ -10,8 +10,13 @@
         templateName: 'confirmation-dialog',
         initialize: function(options) {
             this.message = options.message;
+
             this.resolve = options.resolve;
+            this.okText = options.okText || i18n('ok');
+
             this.reject = options.reject;
+            this.cancelText = options.cancelText || i18n('cancel');
+
             this.render();
         },
         events: {
@@ -21,8 +26,8 @@
         render_attributes: function() {
             return {
                 message: this.message,
-                cancel: i18n('cancel'),
-                ok: i18n('ok')
+                cancel: this.cancelText,
+                ok: this.okText
             };
         },
         ok: function() {