Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/controllers/settings/follower_domains_controller.rb
  Removed upstream. Did the same here. Maybe we should not have?
- config/locales/en.yml
  Upstream removed the “Authorized followers” page and associated
  translations. This is too close in the file to our glitch-soc-specific
  “flavour” string. No actual conflict.
- config/locales/ja.yml
  Same as above.
- config/locales/pl.yml
  Same as above.
- config/navigation.rb
  No real conflict. New route added too close to the glitch-soc-specific
  “flavours” one.
- config/webpack/configuration.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- config/webpack/loaders/babel.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
  The contents of this file have been moved to package.json.
- config/webpack/shared.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- config/webpacker.yml
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- jest.config.js
  The contents of this file have been moved to package.json.
- package.json
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- yarn.lock
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.

app/serializers/rest/instance_serializer.rb

@@ -32,7 +32,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   end
 
   def thumbnail
-    instance_presenter.thumbnail ? full_asset_url(instance_presenter.thumbnail.file.url) : full_pack_url('preview.jpg')
+    instance_presenter.thumbnail ? full_asset_url(instance_presenter.thumbnail.file.url) : full_pack_url('media/images/preview.jpg')
   end
 
   def max_toot_chars

app/serializers/rest/preferences_serializer.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class REST::PreferencesSerializer < ActiveModel::Serializer
+  attribute :posting_default_privacy, key: 'posting:default:visibility'
+  attribute :posting_default_sensitive, key: 'posting:default:sensitive'
+  attribute :posting_default_language, key: 'posting:default:language'
+
+  attribute :reading_default_sensitive_media, key: 'reading:expand:media'
+  attribute :reading_default_sensitive_text, key: 'reading:expand:spoilers'
+
+  def posting_default_privacy
+    object.user.setting_default_privacy
+  end
+
+  def posting_default_sensitive
+    object.user.setting_default_sensitive
+  end
+
+  def posting_default_language
+    object.user.setting_default_language.presence
+  end
+
+  def reading_default_sensitive_media
+    object.user.setting_display_media
+  end
+
+  def reading_default_sensitive_text
+    object.user.setting_expand_spoilers
+  end
+end