fixed rails backend I18n translations and added fallbacks (#5647)

* fixed rails backend I18n translations and added fallbacks

* fixed rubocop issues

* updated fallback language to only english and pass locale for I18n translation meeting starter

* fixed meeting starter spec to expect correct language moderator message

* passing language localization for meeting starter access code

app/services/meeting_starter.rb

@@ -57,8 +57,8 @@ def call
 
   def computed_options(access_code:)
     room_url = "#{root_url(host: @base_url)}rooms/#{@room.friendly_id}/join"
-    moderator_message = "#{I18n.t('meeting.moderator_message')}<br>#{room_url}"
-    moderator_message += "<br>#{I18n.t('meeting.access_code', code: access_code)}" if access_code.present?
+    moderator_message = "#{I18n.t('meeting.moderator_message', locale: @current_user.language.to_sym)}<br>#{room_url}"
+    moderator_message += "<br>#{I18n.t('meeting.access_code', code: access_code, locale: @current_user.language.to_sym)}" if access_code.present?
     {
       moderatorOnlyMessage: moderator_message,
       logoutURL: room_url,

config/application.rb

@@ -84,5 +84,6 @@ class Application < Rails::Application
     config.relative_url_root = '/' if config.relative_url_root.blank?
 
     I18n.load_path += Dir[Rails.root.join('config/locales/*.{rb,yml}').to_s]
+    config.i18n.fallbacks = %i[en]
   end
 end

spec/services/meeting_starter_spec.rb

@@ -37,7 +37,7 @@
   let(:options) do
     url = File.join(base_url, '/rooms/', room.friendly_id, '/join')
     {
-      moderatorOnlyMessage: "To invite someone to the meeting, send them this link:<br>#{url}",
+      moderatorOnlyMessage: "#{I18n.t('meeting.moderator_message', locale: user.language.to_sym)}<br>#{url}",
       logoutURL: url,
       meta_endCallbackUrl: File.join(base_url, '/meeting_ended'),
       'meta_bbb-recording-ready-url': File.join(base_url, '/recording_ready'),