I worked on a localization manager / loader recently because I really required a dynamic behavior which fits ExtJS 4 and MVC. I tried the "official" localization examples, as well as the very recently posted "LocaleManager", but it's not what I was looking for. I hope this will help some of you as well
I still need to test it (tested on Google Chrome only) and enhance it a bit more.
I posted the project on GitHub, at this url:
There is an example with it, please try it.
I'd love to get a some feedbacks Thanks!