Update the Core Language classes to have all method parameter type
declaration.
GetTextReader has gettext as alias to translate.
GetTextReader public methods to get cache enable status and short
circuit (no translation loaded) status
Main language:
Add new methods for plural and plural in context (__n, __p, __pn)
Deprecate gettext, ngettext, _e
Add new translation loader in gettext standard
<locale>/LC_MESSAGES/<domain> style
Including locales checker, auto detect on enviroment variables, return
self as class (for functions type) return translator class after
loading, etc
New LoadFunctions to run all like functions. Names like php but with two
underscores prefixed. eg gettext -> __gettext