Replace old `..._filter` with new `..._action`

app/controllers/admin/admin_controller.rb

 module Admin
   class AdminController < ApplicationController
-
-    before_filter :authenticate_user!
-    before_filter :redirect_unless_admin
-
+    before_action :authenticate_user!
+    before_action :redirect_unless_admin
   end
 end

app/controllers/poll_participations_controller.rb

 class PollParticipationsController < ApplicationController
   include ApplicationHelper
-  before_filter :authenticate_user!
+  before_action :authenticate_user!
 
   def create
     answer = PollAnswer.find(params[:poll_answer_id])
@@ -25,4 +25,4 @@ class PollParticipationsController < ApplicationController
       current_user.find_visible_shareable_by_id(Post, params[:post_id]) || raise(ActiveRecord::RecordNotFound.new)
     end
   end
-end
+end
\ No newline at end of file

app/controllers/sessions_controller.rb

@@ -3,8 +3,8 @@
 #   the COPYRIGHT file.
 
 class SessionsController < Devise::SessionsController
-  after_filter :reset_authentication_token, :only => [:create]
-  before_filter :reset_authentication_token, :only => [:destroy]
+  after_action :reset_authentication_token, only: [:create]
+  before_action :reset_authentication_token, only: [:destroy]
 
   def reset_authentication_token
     current_user.reset_authentication_token! unless current_user.nil?