Multi-language JavaScript messages in Dynamics 365 9.0 using RESX files

One of the not-so-shiny-and-mentioned-on-twitter-and-blogs feature of Dynamics 365 9.0 is simplification of localization of Web Resources. If you have ever worked on a international Dynamics CRM project, which required multiple Language Packs and not all users were using the same language, you probably had some difficulties when trying to show some message on the form using JavaScript or throw an exception with a message from plugin. There was no out-of-the-box localization strategy – some common dictionary with values for multiple languages from which we could easily get the value in current system user language. Of course there are a lot of possibilities here, all of which include usage of some kind of Web Resource like XML or JSON just to store the proper value in all required languages.

Dynamics 365 9.0 introduces new Web Resource type – RESX. This is the very well known, plain old resources file, which we…