Some small fixes for the current I18n implementation

app/controllers/projects/cycle_analytics_controller.rb

@@ -4,6 +4,7 @@ class Projects::CycleAnalyticsController < Projects::ApplicationController
   include CycleAnalyticsParams
 
   before_action :authorize_read_cycle_analytics!
+  before_action :set_locale, only: :show
 
   def show
     @cycle_analytics = ::CycleAnalytics.new(@project, options(cycle_analytics_params))

config/initializers/fast_gettext.rb

 FastGettext.add_text_domain 'gitlab', path: 'locale', type: :po
-FastGettext.default_available_locales = Gitlab::I18n::AVAILABLE_LANGUAGES.keys
 FastGettext.default_text_domain = 'gitlab'
+FastGettext.default_available_locales = Gitlab::I18n::AVAILABLE_LANGUAGES.keys

lib/gitlab/i18n.rb

 module Gitlab
   module I18n
     AVAILABLE_LANGUAGES = {
-      'en' => 'English',
-      'es' => 'Spanish',
-      'de' => 'Deutsch'
+      'en' => N_('English'),
+      'es' => N_('Spanish'),
+      'de' => N_('Deutsch')
     }.freeze
   end
 end