Dynamically resolve locale to country mapping and message bundles

[zcgandcomp]

Currently, there is a built-in static mapping for supported languages and countries. Modify to dynamical mapping without the need for hardcoded parameterization.

Fix HomeControler - dynamically load available languages.
Fix Client.js - add properly locale data to context, load mapping from a external resource.
Fix App.js - init default mapping properly.
Fix localeReducer - dispatch load of locales in a dynamic way.
Fix index.html - creating locale messages has to be dynamic based on configuration.

Those are the places that should be changed - TBD how exactly.