Simple I18n implementation for JavaScript

i18n.coffee

# Example usage:
# I18n.t("application.hello")
# I18n.t("hello", scope: "application")
# Application.t("hello")
#
# Application.t("missing")
# Error: translation missing: pl.application.missing
#
# I18n.locale = "ru"
# Application.t("hello")
@I18n =
  backend:
    en:
      "application.hello": "Hello!"
    pl:
      "application.hello": "Witaj!"
    ru:
      "application.hello": "Здравствуйте!"
  locale: "pl"
  translate: (key, options = {}) ->
    normalized_key = [options.scope, key].filter((val) -> val).join(".")
    I18n.backend[I18n.locale][normalized_key] || throw("translation missing: " + I18n.locale + "." + normalized_key)

@I18n.t = (key, options = {}) ->
  I18n.translate(key, options)

@Application = @Application || {}

@Application.translate = (key, options = {}) ->
  options.scope = ["application", options.scope].filter((val) -> val).join(".")
  I18n.translate(key, options)

@Application.t = (key, options = {}) ->
  Application.translate(key, options)