Remove Tolk, Crowdin substituted it

Why:

* Crowdin now hosts all consul translations publicly so anyone can contribute https://crowdin.com/project/consul/invite
* Crowdin makes easy for non-tech people to contribute, once we have a demo site we'll be able to offer "on site" translation
* If you still use Tolk, we recommend removing this commit (but adding tolk gem to ./Gemfile_custom file to avoid future merge conflicts)

How:

* Reverting changes introduced with 9610a6a933

config/initializers/tolk.rb

@@ -1,25 +0,0 @@
-# encoding: utf-8
-
-# Tolk config file. Generated on January 14, 2016 12:09
-# See github.com/tolk/tolk for more informations
-
-Tolk.config do |config|
-
-  # If you need to add a mapping do it like this :
-  # May we suggest you use http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
-  # config.mapping['en-AU']   = 'English (Australia)'
-  # config.mapping['es-MX']   = 'Spanish (Mexico)'
-  # config.mapping['fr-ES']   = 'Frañol !'
-  # config.mapping['is']      = 'Icelandic'
-  # config.mapping['vi']      = 'Vietnamese'
-
-  # Master source of strings to be translated
-  config.primary_locale_name = 'en'
-end
-
-Tolk::ApplicationController.authenticator = proc {
-  authenticate_or_request_with_http_basic do |username, password|
-    username == Rails.application.secrets.translate_username &&
-      password == Rails.application.secrets.translate_password
-  end
-}

config/routes.rb

@@ -416,7 +416,6 @@ Rails.application.routes.draw do
   end
 
   mount GraphiQL::Rails::Engine, at: '/graphiql', graphql_path: '/graphql'
-  mount Tolk::Engine => '/translate', :as => 'tolk'
 
   # more info pages
   get 'more-information',                     to: 'pages#show', id: 'more_info/index',                as: 'more_info'

config/secrets.yml.example

@@ -33,9 +33,6 @@ production: &production
   google_oauth2_key: ""
   google_oauth2_secret: ""
 
-  translate_username: ""
-  translate_password:  ""
-
   rollbar_server_token: ""
   server_name: ""