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

Conflicts:
- Dockerfile
  Took upstream version and reverted f13ebd02c9.
  Hopefuly it's not needed anymore.
- app/controllers/api/v1/search_controller.rb
  The conflict was due to us raising the number of results returned.
  Upstream raised it further, so took it.
- config/locales/de.yml
  Took upstream changes to theme translation strings.
- config/locales/gl.yml
  Took upstream changes to theme translation strings.
- config/locales/nl.yml
  Took upstream changes to theme translation strings.
- config/locales/sk.yml
  Took upstream changes to theme translation strings.

app/javascript/mastodon/locales/ja.json

@@ -146,6 +146,8 @@
   "hashtag.column_header.tag_mode.all": "と {additional}",
   "hashtag.column_header.tag_mode.any": "か {additional}",
   "hashtag.column_header.tag_mode.none": "({additional} を除く)",
+  "hashtag.column_settings.select.no_options_message": "No suggestions found",
+  "hashtag.column_settings.select.placeholder": "Enter hashtags…",
   "hashtag.column_settings.tag_mode.all": "すべてを含む",
   "hashtag.column_settings.tag_mode.any": "いずれかを含む",
   "hashtag.column_settings.tag_mode.none": "これらを除く",
@@ -208,6 +210,7 @@
   "lists.account.remove": "リストから外す",
   "lists.delete": "リストを削除",
   "lists.edit": "リストを編集",
+  "lists.edit.submit": "Change title",
   "lists.new.create": "リストを作成",
   "lists.new.title_placeholder": "新規リスト名",
   "lists.search": "フォローしている人の中から検索",
@@ -302,7 +305,7 @@
   "status.block": "@{name}さんをブロック",
   "status.cancel_reblog_private": "ブースト解除",
   "status.cannot_reblog": "この投稿はブーストできません",
-  "status.copy": "Copy link to status",
+  "status.copy": "トゥートへのリンクをコピー",
   "status.delete": "削除",
   "status.detailed_status": "詳細な会話ビュー",
   "status.direct": "@{name}さんにダイレクトメッセージ",