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

Conflicts:
	app/controllers/accounts_controller.rb
	app/javascript/mastodon/locales/pl.json
	app/views/about/more.html.haml

Conflicts in `accounts_controller.rb` resolved by taking upstream's
version + our `use_pack`.

Conflicts in `pl.json` resolved by taking upstream's changes.

Conflicts in `aboute/more.html.haml` resolved by taking upstream's changes.

app/controllers/api/v1/accounts/pins_controller.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class Api::V1::Accounts::PinsController < Api::BaseController
+  include Authorization
+
+  before_action -> { doorkeeper_authorize! :write, :'write:accounts' }
+  before_action :require_user!
+  before_action :set_account
+
+  respond_to :json
+
+  def create
+    AccountPin.create!(account: current_account, target_account: @account)
+    render json: @account, serializer: REST::RelationshipSerializer, relationships: relationships_presenter
+  end
+
+  def destroy
+    pin = AccountPin.find_by(account: current_account, target_account: @account)
+    pin&.destroy!
+    render json: @account, serializer: REST::RelationshipSerializer, relationships: relationships_presenter
+  end
+
+  private
+
+  def set_account
+    @account = Account.find(params[:account_id])
+  end
+
+  def relationships_presenter
+    AccountRelationshipsPresenter.new([@account.id], current_user.account_id)
+  end
+end