streamline topic_invite locale

app/models/topic.rb

@@ -582,7 +582,7 @@ class Topic < ActiveRecord::Base
     if private_message?
       # If the user exists, add them to the message.
       user = User.find_by_username_or_email(username_or_email)
-      raise StandardError.new I18n.t("topic_invite_user_exists") if user.present? && topic_allowed_users.where(user_id: user.id).exists?
+      raise StandardError.new I18n.t("topic_invite.user_exists") if user.present? && topic_allowed_users.where(user_id: user.id).exists?
 
       if user && topic_allowed_users.create!(user_id: user.id)
         # Create a small action message
@@ -607,7 +607,7 @@ class Topic < ActiveRecord::Base
     else
       # invite existing member to a topic
       user = User.find_by_username(username_or_email)
-      raise StandardError.new I18n.t("topic_invite_user_exists") if user.present? && topic_allowed_users.where(user_id: user.id).exists?
+      raise StandardError.new I18n.t("topic_invite.user_exists") if user.present? && topic_allowed_users.where(user_id: user.id).exists?
 
       if user && topic_allowed_users.create!(user_id: user.id)
         # rate limit topic invite

config/locales/server.en.yml

@@ -138,8 +138,6 @@ en:
   reading_time: "Reading time"
   likes: "Likes"
 
-  topic_invite_user_exists: "Sorry, that user has already been invited. You may only invite a user to a topic once."
-
   too_many_replies:
     one: "We're sorry, but new users are temporarily limited to 1 reply in the same topic."
     other: "We're sorry, but new users are temporarily limited to %{count} replies in the same topic."
@@ -2747,3 +2745,6 @@ en:
   performance_report:
     initial_post_raw: This topic includes daily performance reports for your site.
     initial_topic_title: Website performance reports
+
+  topic_invite:
+    user_exists: "Sorry, that user has already been invited. You may only invite a user to a topic once."