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.

config/locales/sk.yml

@@ -9,9 +9,6 @@ sk:
     contact: Kontakt
     contact_missing: Nezadané
     contact_unavailable: Neuvedené
-    description_headline: Čo je %{domain}?
-    domain_count_after: ďalším instanciám
-    domain_count_before: Pripojený k
     extended_description_html: |
       <h3>Pravidlá</h3>
       <p>Žiadne zatiaľ nie sú</p>