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

Conflicts manually resolved:
- app/services/post_status_service.rb
- config/locales/simple_form.pl.yml
- config/routes.rb
- config/webpack/loaders/sass.js
- config/webpack/shared.js
- package.json
- yarn.lock

app/models/concerns/domain_normalizable.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module DomainNormalizable
+  extend ActiveSupport::Concern
+
+  included do
+    before_validation :normalize_domain
+  end
+
+  private
+
+  def normalize_domain
+    self.domain = TagManager.instance.normalize_domain(domain)
+  end
+end