configure i18n

Gemfile

@@ -60,3 +60,5 @@ gem 'bootstrap-social-rails', '~> 4.12'
 gem 'font-awesome-rails'
 gem 'jquery-ui-rails'
 gem 'jquery-datatables-rails', '~> 3.4.0'
+
+gem 'http_accept_language'

Gemfile.lock

@@ -70,6 +70,7 @@ GEM
     globalid (0.3.7)
       activesupport (>= 4.1.0)
     hashie (3.4.4)
+    http_accept_language (2.1.0)
     i18n (0.7.0)
     jbuilder (2.6.0)
       activesupport (>= 3.0.0, < 5.1)
@@ -212,6 +213,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   dotenv-rails
   font-awesome-rails
+  http_accept_language
   jbuilder (~> 2.5)
   jquery-datatables-rails (~> 3.4.0)
   jquery-rails

app/controllers/application_controller.rb

@@ -3,6 +3,11 @@ require 'digest/sha1'
 
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
+  before_action :set_locale
+
+  def set_locale
+    I18n.locale = http_accept_language.language_region_compatible_from(I18n.available_locales)
+  end
 
   def current_user
     @current_user ||= User.find_by(id: session[:user_id])

config/application.rb

@@ -12,6 +12,13 @@ module Greenlight
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.
 
+    # i18n
+    # ensure each language has a regional fallback
+    config.i18n.available_locales = %w(en en-US)
+    config.i18n.default_locale = 'en-US'
+    config.i18n.fallbacks = {'en' => 'en-US'}
+
+    # BigBlueButton
     config.bigbluebutton_endpoint = ENV['BIGBLUEBUTTON_ENDPOINT']
     config.bigbluebutton_secret = ENV['BIGBLUEBUTTON_SECRET']
   end