Swap out "@" for "via" in email From field

app/mailers/user_notifications.rb

@@ -76,7 +76,8 @@ class UserNotifications < ActionMailer::Base
 
     # If we have a display name, change the from address
     if username.present?
-      email_opts[:from] = "\"#{username} @ #{SiteSetting.title}\" <#{SiteSetting.notification_email}>"
+      aliased = I18n.t(:via, username: username, site_name: SiteSetting.title)
+      email_opts[:from] = "#{aliased} <#{SiteSetting.notification_email}>"
     end
 
     email = build_email user.email, "user_notifications.user_#{notification_type}", email_opts

config/locales/server.en.yml

@@ -2,6 +2,7 @@ en:
   title: "Discourse"
   topics: "Topics"
 
+  via: "%{username} via %{site_name}"
   is_reserved: "is reserved"
   too_many_mentions: "has too many users mentioned"
   too_many_images: "has too many images"

spec/mailers/user_notifications_spec.rb

@@ -57,7 +57,7 @@ describe UserNotifications do
     its(:from) { should == [SiteSetting.notification_email] }
 
     it "should have the correct from address" do
-      subject.header['from'].to_s.should == "\"#{username} @ #{SiteSetting.title}\" <#{SiteSetting.notification_email}>"
+      subject.header['from'].to_s.should == "#{username} via #{SiteSetting.title} <#{SiteSetting.notification_email}>"
     end