translate flash info for succcessful signup

app/controllers/signup_controller.rb

@@ -47,8 +47,7 @@ class SignupController < ApplicationController
     if @new_user.save
       @invitation.destroy
       session[:u] = @new_user.session_token
-      flash[:success] = "Welcome to #{Rails.application.name}, " <<
-        "#{@new_user.username}!"
+      flash[:success] = I18n.t 'controllers.signup_controller.flashsuccesssignupcontroller'
 
       Countinual.count!("#{Rails.application.shortname}.users.created", "+1")
       Countinual.count!("#{Rails.application.shortname}.users.total",

config/locales/en.yml

@@ -566,6 +566,8 @@ en:
     search_controller:
       searchtitle: "Search"
       flasherrorsearchcontroller: "Sorry, but the search engine is currently out of order"
+    signup_controller:
+      flashsuccesssignupcontroller: "Welcome to %{app}, %{user}!"
     stories_controller:
       submitstorytitle: "Submit Story"
       editstorytitle: "Edit Story"

config/locales/fr.yml

@@ -585,6 +585,8 @@ fr:
     search_controller:
       searchtitle: "Rechercher"
       flasherrorsearchcontroller: "Désolé mais le moteur de recherche est actuellement cassé"
+    signup_controller:
+      flashsuccesssignupcontroller: "Bienvenue sur le %{app}, %{user} !"
     stories_controller:
       submitstorytitle: "Soumettre une info"
       editstorytitle: "Éditer une info"