Rails I18n

Enables the following syntax in views, controllers and models:

syntax	description
`"foo.bar".t`	equivalent to `I18n.t("foo.bar")`
`Catalog.t`	gets the human name of the `Catalog` model (plural by default)
`Catalog.ts`	gets the human name of the `Catalog` model (singular)
`Catalog.tmf('name')`	gets the human name of the `Catalog` model's `name` attribute
`Catalog.t_action('new')`	gets the human name of the `Catalog` model's `new` action label (falls back on generic action labels)

Furthermore, all these methods get the following features:

fallback on the default key: if the lookup for foo.bar.baz.bat is unsucessful, we'll look for foo.bar.default.bat, then foo.default.bat, etc.
missing keys display + logging: in development mode, missing keys are signaled in the UI and logged in log/missing_keys.log