FIX: properly reset all contexts after forking

Fixes hang on backup

lib/discourse.rb

@@ -328,6 +328,9 @@ module Discourse
 
     # in case v8 was initialized we want to make sure it is nil
     PrettyText.reset_context
+
+    Tilt::ES6ModuleTranspiler.reset_context if defined? Tilt::ES6ModuleTranspiler
+    JsLocaleHelper.reset_context if defined? JsLocaleHelper
     nil
   end