FIX: add required dependency

Author: fzngagan

assets/javascripts/wizard-custom.js

@@ -53,6 +53,8 @@
 //= require discourse/app/initializers/jquery-plugins
 //= require discourse/app/pre-initializers/sniff-capabilities
 
+//= require_tree_discourse pretty-text
+
 //= require ember-addons/decorator-alias
 //= require ember-addons/macro-alias
 //= require ember-addons/fmt