Add user preference to always expand toots marked with content warnings (#8762)

config/locales/simple_form.en.yml

@@ -73,6 +73,7 @@ en:
         setting_default_sensitive: Always mark media as sensitive
         setting_delete_modal: Show confirmation dialog before deleting a toot
         setting_display_sensitive_media: Always show media marked as sensitive
+        setting_expand_spoilers: Always expand toots marked with content warnings
         setting_hide_network: Hide your network
         setting_noindex: Opt-out of search engine indexing
         setting_reduce_motion: Reduce motion in animations

config/settings.yml

@@ -27,6 +27,7 @@ defaults: &defaults
   delete_modal: true
   auto_play_gif: false
   display_sensitive_media: false
+  expand_spoilers: false
   preview_sensitive_media: false
   reduce_motion: false
   system_font_ui: false