FEATURE: add setting to omit category name from topic page title tag

config/locales/server.en.yml

@@ -1239,6 +1239,8 @@ en:
 
     read_time_word_count: "Word count per minute for calculating estimated reading time."
 
+    topic_page_title_includes_category: "Topic page title includes the category name."
+
     full_name_required: "Full name is a required field of a user's profile."
     enable_names: "Show the user's full name on their profile, user card, and emails. Disable to hide full name everywhere."
     display_name_on_posts: "Show a user's full name on their posts in addition to their @username."

config/site_settings.yml

@@ -1091,6 +1091,8 @@ uncategorized:
     default: 500
     client: true
 
+  topic_page_title_includes_category: true
+
 user_preferences:
   default_email_digest_frequency:
     enum: 'DigestEmailSiteSetting'

lib/topic_view.rb

@@ -133,7 +133,7 @@ class TopicView
 
   def page_title
     title = @topic.title
-    if @topic.category_id != SiteSetting.uncategorized_category_id && @topic.category_id && @topic.category
+    if SiteSetting.topic_page_title_includes_category && @topic.category_id != SiteSetting.uncategorized_category_id && @topic.category_id && @topic.category
       title += " - #{topic.category.name}"
     end
     title