fix issue with the subject of the invitation email

app/mailers/invitation_mailer.rb

@@ -7,8 +7,7 @@ class InvitationMailer < ActionMailer::Base
 
     mail(
       :to => invitation.email,
-      subject: "[#{Rails.application.name}] You have been invited to " <<
-        Rails.application.name
+      subject: I18n.t 'mailers.invitation_mailer.subject', :appname => "#{Rails.application.name}"
     )
   end
 end

config/locales/en.yml

@@ -5,6 +5,9 @@ en:
   time:
     formats:
       default: "%Y-%m-%d %H:%M:%S"
+  mailers:
+    invitation_mailer:
+      subject: "[%{appname}] You have been invited to %{appname}"
   models:
     moderation:
       storyeditedby: "Your story has been edited by "

config/locales/fr.yml

@@ -17,6 +17,9 @@ fr:
   time:
     formats:
       default: "%d-%m-%Y %H:%M:%S"
+  mailers:
+    invitation_mailer:
+      subject: "[%{appname}] Vous avez été invité au %{appname}"
   models:
     moderation:
       storyeditedby: "Votre info a été éditée par "