Support for localisation

[mindok]

Support for translating labels on sign-in screens (and others).

This may include pre-defined translations included in the library, but should also allow for translating label overrides. For example, you may want to rename the password label as follows:

  override Components.Password.Input do
    set :password_input_label, "Enter the secret phrase we discussed last week"
  end

And have the password label displayed as "Ingresa la frase secreta de la que hablamos la semana pasada" if the user requests Spanish.

[clifinger]

+1 for this one