tiny JS i18n support

i18n.js.coffee

window.i18n = (() ->
  __def_loc = "en_US"
  {
    locale: (loc) ->
      if loc != undefined
        __def_loc = loc
      else
        __def_loc
    , bind: (o) ->
      if o.i18ze == undefined
        o.i18ze = (loc, opts, merge = false) ->
          this._i18n_pool = this._i18n_pool || {}
          opts = $.merge({}, (this._i18n_pool[loc] || {}), opts) if merge
          this._i18n_pool[loc] = opts
      if o.i18zed == undefined
        o.i18zed = (loc) ->
          this._i18n_pool = this._i18n_pool || {}
          this._i18n_pool[loc || i18n.locale()]
      o
  }
)()

i18n.locale("ru_RU")

window.Date.prototype.getMonthName = function() {
  opts = Date.i18zed()
  return opts.month_names[this.getMonth()] if opts != undefined
}

window.i18n.bind(Date).i18ze("ru_RU", { month_names: ["январь", "февраль", "март", "апрель", "май", "июнь", "июль", "август", "сентябрь", "октябрь", "декабрь"]})
d = new Date()
d.getMonthName()