Dictionary for translation of text in automaton-core

Is empty right now but will contain all translation factorized for all applications

All known languages in `automaton-core`, subsequent namespaces are forced to use only known languages there.
Language concept could be enriched with language definition or other data, for instance, the flag of a language, ...

It is only a place for language description, not to tell where it is supposed to be used
See cust-app themselves to know what language they use

Helper functions to test correctness of translation data including dictionaries

Protocol for translation logic

Implementation of `automaton-core.i18n.translator/Translator` protocol with [tempura](https://github.com/taoensso/tempura)

Is an adapter for translation in `automaton-core`, so no web related technology is mentionned there, even if tempura provides them.
It will be the job of `automton-web` to provide that features