Support several levels of fallback if locale does not exist. It removes the last part after "_" and checks if translations exist. It does that until all parts of the locale are checked.
In case there is no match the default fallback locale is used.

Example: sr_Latn_RS

> checks sr_Latns_RS
> checks sr_Latn
> checks sr
> default fallback

Update translator.js
Merge branch 'master' of git://github.com/nikolajosipovic/BazingaJsTranslationBundle

Conflicts:
	Resources/js/translator.js