Add authentication with devise, fix tests

app/controllers/application_controller.rb

@@ -2,4 +2,5 @@ class ApplicationController < ActionController::Base
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
   protect_from_forgery with: :exception
+  before_action :authenticate_admin!
 end

app/controllers/problems_controller.rb

@@ -1,4 +1,5 @@
 class ProblemsController < ApplicationController
+  skip_before_action :authenticate_admin!, only: [:index, :show]
   before_action :set_problem, only: [:show]
 
   def index

app/controllers/translations_controller.rb

@@ -1,4 +1,5 @@
 class TranslationsController < ApplicationController
+  skip_before_action :authenticate_admin!, only: [:new, :create]
   before_action :set_translation, only: :show
   before_action :set_problem, only: [:new, :create]
 

app/views/layouts/application.html.erb

@@ -26,7 +26,9 @@
     <%= horizontal do %>
         <%= nav class: 'navbar-left' do %>
             <%= link_to Problem.model_name.human(count: 2), problems_path %>
-            <%= link_to Translation.model_name.human(count: 2), translations_path %>
+            <% if admin_signed_in? %>
+              <%= link_to Translation.model_name.human(count: 2), translations_path %>
+            <% end %>
         <% end %>
         <%= nav class: 'navbar-right' do %>
       <% if admin_signed_in? %>