Merge remote-tracking branch 'origin/master' into merge-upstream

Conflicts:
	app/javascript/styles/mastodon/components.scss
	app/javascript/styles/mastodon/modal.scss

app/models/mute.rb

@@ -14,8 +14,8 @@
 class Mute < ApplicationRecord
   include Paginable
 
-  belongs_to :account, required: true
-  belongs_to :target_account, class_name: 'Account', required: true
+  belongs_to :account
+  belongs_to :target_account, class_name: 'Account'
 
   validates :account_id, uniqueness: { scope: :target_account_id }