Add option to disable real-time updates in web UI (#9984)

Fix #9031
Fix #7913

config/locales/simple_form.en.yml

@@ -35,6 +35,7 @@ en:
         setting_noindex: Affects your public profile and status pages
         setting_show_application: The application you use to toot will be displayed in the detailed view of your toots
         setting_use_blurhash: Gradients are based on the colors of the hidden visuals but obfuscate any details
+        setting_use_pending_items: Hide timeline updates behind a click instead of automatically scrolling the feed
         username: Your username will be unique on %{domain}
         whole_word: When the keyword or phrase is alphanumeric only, it will only be applied if it matches the whole word
       featured_tag:
@@ -111,6 +112,7 @@ en:
         setting_theme: Site theme
         setting_unfollow_modal: Show confirmation dialog before unfollowing someone
         setting_use_blurhash: Show colorful gradients for hidden media
+        setting_use_pending_items: Slow mode
         severity: Severity
         type: Import type
         username: Username

config/settings.yml

@@ -33,6 +33,7 @@ defaults: &defaults
   aggregate_reblogs: true
   advanced_layout: false
   use_blurhash: true
+  use_pending_items: false
   notification_emails:
     follow: false
     reblog: false