Update language spanish, add placeholders in signup, add behavior fromWhere

[wzalazar]

Solution the error in the placeholder for email, change
placeholder="{{emailPlaceholder}} by placeholder="{{t9n 'email'}}

Exception in template helper: ReferenceError: t9n is not defined
Object.AccountsEntry.entrySignInHelpers.emailPlaceholder

add placeholders

placeholder="{{t9n 'email'}}
placeholder="{{t9n 'username'}}"
placeholder="{{t9n 'signupCode'}}"

Apply correct way the lenguage spanish

add new property, fromWhere:false , with this only redirects to dasboard by default, not redirects a route before log-in

add condition for that behavior from Where

[pavel-kurnosov]

+1 to merge it. Because this is fix for this issue:
#299

[drfraker]

+1 to merge this. Having the same issue as others are with this.

[funkyeah]

I don't think this will work anymore anyway. The existing functionality is now broken as far as I can tell in a number of ways starting here and below:

route.name is no longer valid, should be route.getName()

Router.current().path is also no longer valid. should be Iron.Location.get().pathname or something like that:

finally:

[_.each Router.routes, (route)->]

I'm not 100% sure cause I don't understand iron-router that well, but I believe, Router.routes returns an array of middle-ware functions that don't exactly work with the stuff inside each... not sure how to fix this though

any ideas on the last part?

[funkyeah]

here's what ended up working for me

exclusions = []
_.each Router.routes, (route)->
  exclusions.push route.getName()

# Change the fromWhere session variable when you leave a path
Router.onStop ->
  # If the route is an entry route, no need to save it
  if (!_.contains(exclusions, Router.current().route?.getName()))
    Session.set('fromWhere', window.location.pathname)

note that i used window.location.pathname instead of Iron.Location.get().pathname because by the time onStop is called the latter has already changed to the new routes path