Setup welcome page & localization support

Few lines of ruby code, mostly env setup.
Translation keys are hard. What would you call this?

In this case, if it comes from a model (User), you can also rely on the i18n's translation hierarchy.. so ot could be something like:

````
en:
  activerecord:
    models:
      user: Dude
    attributes:
      user:
        login: "Handle"
      # will translate User attribute "login" as "Handle"
  
````