add i18n for invitation_request_mailer subject

app/mailers/invitation_request_mailer.rb

@@ -7,8 +7,7 @@ class InvitationRequestMailer < ActionMailer::Base
 
     mail(
       :to => invitation_request.email,
-      subject: "[#{Rails.application.name}] Confirm your invitation " <<
-        "request to " << Rails.application.name
+      subject: I18n.t('mailers.invitation_request_mailer.subject', :appname => "#{Rails.application.name}")
     )
   end
 end

config/locales/en.yml

@@ -13,6 +13,8 @@ en:
       mentionsubject: "[%{appname}] Mention from %{author} on %{story}"
     invitation_mailer:
       subject: "[%{appname}] You have been invited to %{appname}"
+    invitation_request_mailer:
+      subject: "[%{appname}] Confirm your invitation request to  %{appname}"
   models:
     comment:
       commentcannotbeblank: "A comment cannot be blank."

config/locales/fr.yml

@@ -25,6 +25,8 @@ fr:
       mentionsubject: "[%{appname}] %{author} vous a mentionné dans %{story}"
     invitation_mailer:
       subject: "[%{appname}] Vous avez été invité au %{appname}"
+    invitation_request_mailer:
+      subject: "[%{appname}] Confirmez votre demande d'invitation au %{appname}"
   models:
     comment:
       commentcannotbeblank: "Un commentaire ne peut pas être vide."